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Grade 4 Add & Subtract Challenge

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Quick true/false drill on add & subtract.

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South Africa

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Grade 4 Add & Subtract Challenge
 

Grade 4 Add & Subtract ChallengeOnline version

Quick true/false drill on add & subtract.

by Christelle McMurtry
1

The sum of 34 and 29 is 63.

2

6 + 7 = 12.

3

Adding two-digit numbers may require carrying to the tens place.

4

A subtraction check can be done by adding the difference to the smaller number to reach the larger number.

5

The difference between 200 and 150 is 50.

6

Subtracting 0 from a number leaves it unchanged.

7

15 - 9 = 7.

8

Subtracting a smaller number from a larger number may require borrowing.

9

In subtraction, you always borrow from the hundreds place.

10

100 - 25 = 75.

11

Carrying is required in every addition.

12

When adding, you align digits by place value.

13

Estimating sums helps check if the answer is reasonable.

14

When adding decimals, you ignore the decimal points.

15

The sum of 5 and 9 is 14.

16

The commutative property applies to addition: a + b = b + a.

17

9 + 9 = 19.

18

0 is the additive identity: a + 0 = a.

19

The commutative property does not apply to addition.

20

The tens place never changes when adding 25 and 25.

21

The sum of 90 and 15 is 105.

22

100 - 25 = 70.

23

0 cannot be added to a number.

24

100 + 200 = 400.

25

Adding tens and ones separately is a common method for two-digit addition.

26

The sum of 40 and 40 equals 60.

27

The associative property applies to addition: (a + b) + c = a + (b + c).

28

In subtraction, you always subtract the larger digit from the smaller one.

29

A carry is written when a column sum is 10 or more.

30

50 - 60 = 10.

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