More addition, checking, and subtraction links
Answers are for parents and teachers.
1
Add 84 + 49 and show your carries.
4 + 9 = 13, carry 1. 8 + 4 + 1 = 13 tens. The sum is 133.
2
Write the four sentences of the fact family of 12, 5 and 7.
5 + 7 = 12, 7 + 5 = 12, 12 − 5 = 7, 12 − 7 = 5.
3
Check 90 − 36 = 54 by adding.
54 + 36 = 90, so it is right.
4
Find the mistake: 38 + 45 = 73. Write the right answer.
8 + 5 = 13, carry 1. 3 + 4 + 1 = 8. The right answer is 83.
5
What number do the blocks show? Write an addition sentence that makes it.
123. For example 86 + 37 = 123.