4. Subtracting an even number from another even number gives an odd number. 5. Subtracting an odd number from another odd number gives an even number

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1 Level A 1. What is 78 32? A) 48 B) 110 C) 46 D) What is 57 19? A) 37 B) 38 C) 42 D) What is 66 8? A) 58 B) 57 C) 52 D) Subtracting an even number from another even number gives an odd number 5. Subtracting an odd number from another odd number gives an even number 6. Subtracting a 2 digit whole number from another 2 digit whole number produces a 1 digit number

2 7. Is the following true or false? = 37 A) True B) False 8. Is the following true or false? = 49 A) True B) False 9. What method is being used? 67 9 = = 60 2 = 58 A) Bridging B) Partitioning C) Using number line D) Compensation 10. What method is being used? = = 3 Answer = 33 A) Bridging B) Partitioning C) Using number line D) Compensation

3 Level B 1. What is ? A) 359 B) 451 C) 351 D) What is ? A) 549 B) 547 C) 551 D) What is 291 5? A) 285 B) 286 C) 296 D) Subtracting an even number from an odd number gives an even number 5. Subtracting an odd number from an even number gives an odd number 6. Subtracting a 3 digit positive whole number from another 3 digit whole number produces a 4 digit number

4 7. Is the following true or false? = 805 A) True B) False 8. Is the following true or false? = 122 A) True B) False 9. What method is being used? = = 348 A) Bridging B) Partitioning C) Using number line D) Compensation 10. What method is being used? = = 204 A) Bridging B) Partitioning C) Using number line D) Compensation

5 Level C 1. What is ? A) 425 B) 427 C) 525 D) What is ? A) 2499 B) 2500 C) 2001 D) What is ? A) 5546 B) 5396 C) 6346 D) Adding two even numbers and subtracting an odd number gives an even number 5. Subtracting a 3 digit whole number from a 4 digit whole number gives a number with 4 digits 6. Subtracting two numbers rounded to the nearest 100 gives the answer to the nearest 100

6 7. Is the following true or false? = 6030 A) True B) False 8. Is the following true or false? = 6230 A) True B) False 9. What method is being used? = = 2684 A) Bridging B) Partitioning C) Using number line D) Compensation 10. What method is being used? = = 1379 A) Bridging B) Partitioning C) Using number line D) Compensation

7 Answer Level A 1. What is 78 32? The correct answer is: C = = = What is 57 19? The correct answer is: B = = What is 66 8? The correct answer is: A = = Subtracting an even number from another even number gives an odd number The correct answer is: C. Never. The result will always be even although the number might be negative (or zero).

8 5. Subtracting an odd number from another odd number gives an even number The correct answer is: B. Always. Note that it could be a negative even number or zero these count as even numbers 6. Subtracting a 2 digit whole number from another 2 digit whole number produces a 1 digit number The correct answer is: A. Sometimes. For example, = = 4 7. Is the following true or false? = 37 The correct answer is: A. True. You can get the correct answer in the following way: = = Is the following true or false? = 49 The correct answer is: B. False. You can get the correct answer in the following way: = = 39

9 9. What method is being used? 67 9 = = 60 2 = 58 The correct answer is: A. Bridging. Working out what you need to subtract to the nearest ten and then subtracting the remainder 10. What method is being used? = = 3 Answer =33 The correct answer is: B. Partitioning. Breaking into tens and units, subtracting them separately and putting them back together.

10 Level B 1. What is ? The correct answer is: C = What is ? The correct answer is: A = = What is 291 5? The correct answer is: B = = Subtracting an even number from an odd number gives an even number The correct answer is: C. Never. Subtracting an even number from an odd number is always even 5. Subtracting an odd number from an even number gives an odd number The correct answer is: B. Always

11 6. Subtracting a 3 digit positive whole number from another 3 digit whole number produces a 4 digit number The correct answer is: C. Never The biggest number is = Is the following true or false? = 805 The correct answer is: B. False = = Is the following true or false? = 122 The correct answer is: B. False = = What method is being used? = = 348 The correct answer is: D. Compensation Take off a round number, such as a multiple of ten, and adjust - for example, by adding back if you have taken away too much.

12 10. What method is being used? = = 204 The correct answer is: B. Partitioning. Break down into hundreds, tens and units, subtract separately and then put back together.

13 Level C 1. What is ? The correct answer is: A = = What is ? The correct answer is: C = What is ? The correct answer is: A = = Adding two even numbers and subtracting an odd number gives an even number The correct answer is: C. Never Adding two even numbers always gives an even number. So the answer is the same as subtracting an odd number from an even which always gives an odd number.

14 5. Subtracting a 3 digit whole number from a 4 digit whole number gives a number with 4 digits The correct answer is: A. Sometimes = = 1 6. Subtracting two numbers rounded to the nearest 100 gives the answer to the nearest 100 The correct answer is: A. Sometimes = = 300 (yes) = = 400 (no) 7. Is the following true or false? = 6030 The correct answer is: A. True = = Is the following true or false? = 6230 The correct answer is: A. True

15 9. What method is being used? = = 2684 The correct answer is: A. Bridging. Subtract to the nearest 10 and then the subtract the remainder. 10. What method is being used? = = 1379 The correct answer is: D. Compensation. Subtract a number that has been rounded (to the nearest 1000 in this case) and then adjust (by adding back the extra 100 here).

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