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15 - 5 = 10, so 10 + 5 = 15!

# Use Addition to Check Subtraction - Counting on from any Given Number

This Math quiz is called 'Use Addition to Check Subtraction - Counting on from any Given Number' and it has been written by teachers to help you if you are studying the subject at elementary school. Playing educational quizzes is a fun way to learn if you are in the 1st or 2nd grade - aged 6 to 8.

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Recognizing that addition is the inverse, or opposite, of subtraction is useful when it comes to checking answers. For example, realizing that 13 - 8 = 5 could be checked by adding 8 + 5 to give 13 means that subtraction calculation answers can be accurately checked.

Use this quiz the practice checking subtractions with addition.

1.
Why is 48 - 20 = 54 incorrect?
Because 48 is more than 20
Because the numbers are all even
Because 20 + 54 = 74, not 48
Because the total of all three numbers is 122
The answer to a subtraction cannot be larger than the number at the beginning!
2.
Which calculation could you use to check that 18 - 7 = 11 is correct?
11 + 18
7 + 18
7 + 11
11 + 7 + 18
Adding the two smaller numbers should total the larger number
3.
How could you check that 24 - 8 = 16?
By checking that 16 + 8 = 24
By checking the total of all three numbers
By finding the difference between 16 and 8
By finding the total of 24 and 8
Adding the two smaller numbers should give the larger one
4.
Which calculation proves this calculation is incorrect?
76 - 34 = 45
76 - 45 = 34
45 - 34 = 11
34 + 45 = 79
34 + 45 = 76
The two smaller numbers do not add to total the larger one
5.
Which calculation could you use to check that 23 - 6 = 17 is correct?
6 + 17
23 + 7
23 + 6 + 7
23 + 6 + 7
If adding the two smaller numbers does not give the larger number as their total, something has gone wrong!
6.
Which calculation proves this calculation is incorrect?
62 - 19 = 55
55 + 19 = 62
55 + 19 = 74
62 + 19 = 55
62 + 55 = 19
The two smaller numbers do not add to total the larger one
7.
Check 67 - 25 = 42 with addition. Is this calculation correct?
Incorrect answer: 25 + 67 = 92
Correct answer: 25 - 67 = 42
Incorrect answer: 67 + 42 = 109
Correct answer: 25 + 42 = 67
The two smaller numbers add to give 67
8.
Which calculation shows that this subtraction is correct?
78 - 40 = 38
40 + 78 = 38
40 - 38 = 78
38 + 78 = 40
38 + 10 + 10 + 10 + 10 = 78
Adding 4 groups of 10 to 38 gives the starting number of 78
9.
Why is 33 - 20 = 13 true?
Because the sum of all three numbers gives the same answer
Because 13 subtracted from 20 is 33
Because the total of 13 and 33 is 20
Because 20 + 13 = 33
If you had 33 pennies and took 20 away (leaving 13), putting them all back again (13 + 20) would result in 33 pennies again
10.
Check 84 - 21 = 73 with addition. Is this calculation correct?
Correct answer: 73 + 21 = 84
Incorrect answer: 73 + 21 = 94
Incorrect answer: 84 + 21 = 105
Incorrect answer: 84 + 73 = 157
The two smaller numbers do not add to give the larger number, so the original calculation is incorrect
Author:  Angela Smith