Multiply by 10, 10 = 1 Dime

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LESSON 5 Multiply by 10, 10 = 1 Dime LESSON 5 Multiply by 10, 10 = 1 Dime When multiplying by 10, encourage the student to look for patterns. Notice that whenever you multiply 10 times any number, the answer is that number plus a zero. That is because 10 is made up of a 1 digit and a 0 digit. So 4 x 10 is 4 x 1 = 4 and 4 x 0 = 0, or 40. To make sure the student has this concept, I like to ask, What is banana times 10? The answer is banana zero pronounced banana-ty. The ty stands for 10. These are easy facts to learn and remember, but don t take them for granted. Make sure they are mastered using any of the techniques shown below. On the worksheets, there have been rectangles where the student wrote in the fact at the end of the line in the space with an underline. These can be put to another use by adding the multiplication problem to the multiple of 10. Here are a few examples. 10 20 30 40 Ten counted one time equals ten or 10 x 1 = 10. Ten counted two times equals twenty or 10 x 2 = 20. Ten counted three times equals thirty or 10 x 3 = 30. Ten counted four times equals forty or 10 x 4 = 40. MULTIPLY BY 10, 10 = 1 DIME - LESSON 5 31

10 6 = 60 10 5 = 50 10 4 = 40 10 3 = 30 10 2 = 20 10 1 = 10 Another way to show this is on a number chart. Circling all of the 10 facts, or multiples of 10, reveals the pattern that corresponds to the blocks above. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 Of course each fact can be built in the shape of a rectangle. Whenever illustrating with the blocks, also write it and say it as you build. 10 counted 5 times is the same as 50, or 10 times 5 equals 50, or 10 over and 5 up is 50. Counting by 10 is the first step. After this is accomplished, say the factors slowly, and then ask the student to say the product. For example, you say ten counted one time, or 10 times one, and the student says 10. Continue by saying 10 times 2, and the student says 20. (I often have the student say two-ty as well as 20 to show there is order in our words.) Proceed through all the facts sequentially just as when the student learned to count by 10. 32 LESSON 5 - MULTIPLY BY 10, 10 = 1 DIME GAMMA

Here are the 10 facts with the corresponding numbering. 0 10 20 30 40 50 60 70 80 90 100 ( 10)( 0) ( 10)( 1) ( 10)( 2) ( 10)( 3) ( 10)( 4) (10)( 5) ( 10)( 6) ( 10)( 7) ( 10)( 8) ( 10)( 9) (10)( 10) 10 counted 1 time 10 counted 4 times 10 counted 9 times 0 x 0 0 x 1 0 x 2 0 x 3 0 x 4 0 x 5 0 x 6 0 x 7 0 x 8 0 x 9 0 x 10 1 x 0 1 x 1 1 x 2 1 x 3 1 x 4 1 x 5 1 x 6 1 x 7 1 x 8 1 x 9 1 x 10 2 x 0 2 x 1 2 x 2 2 x 3 2 x 4 2 x 5 2 x 6 2 x 7 2 x 8 2 x 9 2 x 10 3 x 0 3 x 1 3 x 2 3 x 3 3 x 4 3 x 5 3 x 6 3 x 7 3 x 8 3 x 9 3 x 10 4 x 0 4 x 1 4 x 2 4 x 3 4 x 4 4 x 5 4 x 6 4 x 7 4 x 8 4 x 9 4 x 10 5 x 0 5 x 1 5 x 2 5 x 3 5 x 4 5 x 5 5 x 6 5 x 7 5 x 8 5 x 9 5 x 10 6 x 0 6 x 1 6 x 2 6 x 3 6 x 4 6 x 5 6 x 6 6 x 7 6 x 8 6 x 9 6 x 10 7 Dime x 0 7 x 1 7 x 2 7 x 3 7 x 4 7 x 5 7 x 6 7 x 7 7 x 8 7 x 9 7 x 10 8 x 0 8 x 1 8 x 2 8 x 3 8 x 4 8 x 5 8 x 6 8 x 7 8 x 8 8 x 9 8 x 10 9 x 0 9 x 1 9 x 2 9 x 3 9 x 4 9 x 5 9 x 6 9 x 7 9 x 8 9 x 9 9 x 10 10 x 0 10 x 1 10 x 2 10 x 3 10 x 4 10 x 5 10 x 6 10 x 7 10 x 8 10 x 9 10 x 10 10 = 1 Dime - A good place to apply math is with money. We ve learned that 10 is the same as one dime, so we can ask how many pennies in six dimes to apply 6 x 10. The answer is 60. = = Dime 10 1 1 1 1 1 1 1 1 1 1 Example How many pennies, or cents, in six dimes? 10 10 10 10 10 10 6 10 = 60 GAMMA MULTIPLY BY 10, 10 = 1 DIME - LESSON 5 33

We will be reviewing and using multiplication facts throughout the student textbook. If you find that you need more review of the multiplication facts, consult the Math-U-See Web site, which provides online drill and downloadable work sheets. Go to www.mathusee.com and click on Online Helps. 34 LESSON 5 - MULTIPLY BY 10, 10 = 1 DIME GAMMA

l e s s o n p r a c t i c e Find the answer by multiplying. 5A 1. 10 x 0 = 2. 5 x 10 = 3. 10 x 2 = 4. 6 x 10 = 5. (10)(10) = 6. (10)(3) = 7. 10 9 = 8. 10 7 = 9. 10 10. 10 5 11. 10 1 12. 10 3 13. 10 x 7 = 14. 4 x 10 = 7 x 10 = 10 x 4 = 15. 10 x 6 = 16. 10 x 3 = 6 x 10 = 3 x 10 = GAMMA Lesson Practice 5A 55

LESSON PRACTICe 5A Color all the boxes that have a number you would say when skip counting by 10. Notice the pattern. 17. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 515253545556575859 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 7576777879 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 9899 18. How many pennies are in four dimes? 19. Ten counted nine times equals. 20. Ten cars went by the house every hour. How many cars went by in six hours? 56 GAMMA

l e s s o n p r a c t i c e Find the answer by multiplying. 5B 1. 10 x 8 = 2. 1 x 10 = 3. 10 x 9 = 4. 0 x 10 = 5. (10)(5) = 6. (10)(4) = 7. 10 6 = 8. 10 10 = 9. 10 8 10. 10 7 11. 10 12. 10 1 13. 10 x 5 = 14. 8 x 10 = 5 x 10 = 10 x 8 = 15. 10 x 0 = 16. 10 x 9 = 0 x 10 = 9 x 10 = GAMMA Lesson Practice 5B 57

LESSON PRACTICe 5B Skip count and write the missing numbers. Then fill in the missing factors. 17. 0 10 ( 10)( 0 ) (10)( ) (10)(2) 30 (10)( ) (10)(4) (10)( ) (10)(6) (10)( ) (10)(8) 90 (10)( ) (10)(10) 18. How many pennies or cents are in seven dimes? 19. Ten counted six times equals. 20. There are 10 math problems on each of five pages. How many problems are there in all? 58 GAMMA

l e s s o n p r a c t i c e Find the answer by multiplying. 5C 1. 3 x 10 = 2. 8 x 10 = 3. 10 x 1 = 4. 2 x 10 = 5. (10)(9) = 6. (7)(10) = 7. 10 5 = 8. 6 10 = 9. 10 0 10. 10 4 11. 10 10 12. 10 3 13. 10 x 1 = 14. 10 x 4 = 1 x 10 = 4 x 10 = 15. 10 x 2 = 16. 7 x 10 = 2 x 10 = 10 x 7 = GAMMA Lesson Practice 5C 59

LESSON PRACTICe 5C Color all the boxes that have a number you would say when skip counting by 10. What kind of pattern do you see? 17. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 515253545556575859 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 7576777879 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 9899 18. How many pennies or cents are in five dimes? 19. Ten counted three times equals. 20. The professor paid two 10-dollar bills for his new book. How much did the book cost?. 60 GAMMA

s y s t e m a t i c r e v i e w Find the answer by multiplying. 5D 1. 10 5 = 2. 7 x 10 = 3. 10 2 = 4. (10)(10) = 5. 2 5 6. 10 5 7. 6 8. 7 9. 1 3 10. 9 11. 10 8 12. 10 4 13. 9 x 2 = 14. 4 x 2 = 2 x 9 = 2 x 4 = 15. 10 x 3 = 16. 5 x 2 = 3 x 10 = 2 x 5 = GAMMA systematic review 5D 61

Systematic review 5D Quick Review These two-digit addition and subtraction problems can be done without regrouping. Just add or subtract the units and the tens. The first one is done for you. Add or subtract. 17. 21 + 32 5 3 18. 43 + 43 19. 28 16 20. 89 51 21. Jessica slept 7 hours a day for the last 10 days. How much sleep did she get in 10 days? 22. Jessica s little sister Julie still takes naps, so she got 20 more hours of sleep than Jessica during the last 10 days. How much sleep did Julie get during that time? You will need to use your answer from #21. 62 GAMMA

s y s t e m a t i c r e v i e w Find the answer by multiplying. 5E 1. 10 8 = 2. 6 x 10 = 3. 10 9 = 4. (10)(0) = 5. 5 1 6. 6 7. 8 1 8. 10 5 9. 2 10. 2 5 11. 9 x 1 = 12. 3 x 10 = 1 x 9 = 10 x 3 = Rewrite using place-value notation. 13. 389 = + + 14. 72 = + GAMMA systematic review 5E 63

Systematic review 5E Add or subtract. 15. 46 + 22 16. 51 + 12 17. 37 23 18. 94 43 19. How many cents are there in eight dimes? 20. There are four people in our family. How many fingers do we have in all? 21. Grandma made six cherry pies and four apple pies. Aunt Mona cut each pie into 10 pieces. How many pieces of pie were there when she was done? 22. noah bought nine quarts of milk. How many pints of milk does he have? 64 GAMMA

s y s t e m a t i c r e v i e w Find the answer by multiplying. 5F 1. 4 1 = 2. 2 x 10 = 3. 10 3 = 4. (10)(9) = 5. 6 6. 2 8 7. 10 7 8. 10 1 9. 3 10. 4 11. 1 6 12. 9 0 Rewrite using place-value notation. 13. 164 = + + 14. 58 = + GAMMA systematic review 5F 65

Systematic review 5F Add or subtract. 15. 52 20 16. 64 + 13 17. 35 + 34 18. 14 12 19. What is five counted 10 times? 20. How many cents does Shane have if he has nine dimes? 21. Max has 5 dollars. Wayne has 10 times as much money as Max. How many dollars does Wayne have? How much money do Max and Wayne have altogether? 22. Karyn filled eight quart jars with jam. How many pints of jam did she make? 66 GAMMA

t e s t Find the answer by multiplying. 5 1. 2 x 10 = 2. 10 x 9 = 3. 3 x 10 = 4. 10 x 7 = 5. (6)(10) = 6. (10)(1) = 7. 4 10 = 8. 10 5 = 9. 10 8 10. 5 11. 1 3 12. 8 GAMMA test 5 11

test 5 Add or subtract. 13. 34 21 14. 55 + 42 15. 18 1 16. 60 + 17 17. Rewrite using place-value notation: 194 = + + 18. Jeremy has seven dimes. How many cents does he have? 19. Christa bought 10 quarts of milk. How many pints did she buy? Her son and his friends drank 10 pints of milk. How many pints were left over? 20. Jason jogged 3 miles a day for 10 days. How many miles did he jog altogether? 12 GAMMA

Lesson Practice 5A - LESSON PRACTICE 5C LessonPractice5A 1. 2. 3. 4. 5. 6. 7. 8. 10 0 = 0 5 10 = 50 10 = 20 6 10 = 60 10 10 = 100 10 3= 30 10 9 = 90 10 7 = 70 9. 10 = 20 10. 10 5= 50 11. 10 1= 10 12. 10 3= 30 13. 10 7 = 70 7 10 = 70 14. 4 10 = 40 10 4 = 40 15. 10 6 = 60 6 10 = 60 16. 10 3= 30 3 10 = 30 17. 6. 7. 8. 9. 10 4 = 40 10 6 = 60 10 10 = 100 10 8 = 80 10. 11. 12. 13. 10 7 = 70 10 = 20 10 1= 10 10 5= 50 5 10 = 50 14. 8 10 = 80 10 8 = 80 15. 10 0 = 0 0 10 = 0 16. 10 9 = 90 9 10 = 90 17. 0 10 20 30 ( 10)( 0) ( 10)( 1) ( 10)( 2) (10)( 3) 40 ( 10)( 4) 50 ( 10)( 5) 60 ( 10)( 6) 70 ( 10)( 7) 80 ( 10)( 8) 90 ( 10)( 9) 100 ( 10)( 10) 18. 10 + 10 + 10 + 10 + 10 + 10 + 10 = 70c/ 19. 20. 10 6 = 60 10 5= 50 problems 18. 10 + 10 + 10 + 10 = 40c / or 40 pennies 19. 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 = 90 20. 10 6 = 60 cars LessonPractice5B 1. 2. 3. 4. 5. 10 8 = 80 1 10 = 10 10 9 = 90 0 10 = 0 10 5= 50 LessonPractice5C 1. 2. 3. 4. 5. 6. 7. 8. 3 10 = 30 8 10 = 80 10 1= 10 2 10 = 20 10 9 = 90 7 10 = 70 10 5= 50 6 10 = 60 9. 10 0 = 0 10. 10 4 = 40 11. 10 10 = 100 12. 10 3= 30 13. 10 1= 10 1 10 = 10 14. 10 4 = 40 4 10 = 40 122 solutions gamma

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