Remember: Take away, then add back. If you land on the start, your answer is right.
Read and answer
Read the story, then answer.
Checking the bead boxThe fair was nearly over, and Mia and Ben counted their bead box. That morning there had been 71 beads in it. They had sold 24, so how many were left? Ben worked it out on the frame and said 47. Mia asked if he had checked it. Her trick was to add the sold beads back on. If 47 and 24 made 71, the answer was right. Later Ben raced through another sum, 83 take away 49, and wrote 46 in a flash. He saw three ones and nine ones and took the small from the big. But three ones cannot take away nine, so he should have borrowed.
1
There were 71 beads. They sold 24. 71 - 24 =
2
Mia adds the sold beads back on. 47 + 24 =
3
If you add back what you took away and land on the start, the answer is right.
TrueFalse
4
Ben says 83 - 49 = 46. Mia adds back: 46 + 49 = 95. Is Ben right?
Yes, because 95 is bigNo, because 95 is not 83Yes, because 46 is small
On the frame
A good checker always lands home.
5
Which frame shows where 47 + 24 lands? The top row is tens.
ABC
6
The frame shows 62. Take away 35. 62 - 35 =
7
Now add back on the frame. 27 + 35 =
8
Check 84 - 29 = 55. Add back: 55 + 29 =
9
Which add back checks 72 - 38 = 34?
34 + 7234 + 3872 + 38
Be the checker
10
Ben's answer 46 was right for 83 - 49.
TrueFalse
11
Ben says 75 - 38 = 43. Add back: 43 + 38 =
12
Now fix it. 75 - 38 =
13
Join each sum to the sum that checks it.
170 - 25
260 + 18
392 - 47
A78 - 18
B45 + 47
C45 + 25
14
Check big ones too. 305 - 128 =
15
Write a take away sum. Then write the add back that checks it.
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