Question 1

Mike subtracted two decimals and got 7.95 as the result. His calculation was 12.5 - 4.75. What is the error in Mike's calculation?

Accepted Answer

Mike forgot to borrow, the correct answer is

7.75

Answer

Mike added instead of subtracting, the correct answer is

7.75

Answer

Mike swapped the minuend and subtrahend, the correct answer is

7.75

Answer

Mike calculated correctly, there is no error

Question 2

Sarah added 3.62 and 5.48 and got 9.10. What mistake did Sarah make in her addition?

Accepted Answer

Sarah added incorrectly, the correct answer is

7.75

Answer

Sarah swapped the addends

Answer

Sarah forgot to carry over a 1

Answer

Sarah aligned the decimal points incorrectly

Question 3

Jessica subtracted 3.67 from 10.45 and got 6.88. What mistake did Jessica make in her subtraction?

Accepted Answer

Jessica subtracted incorrectly, the correct answer is

7.75

Answer

Jessica forgot to add a trailing zero

Answer

Jessica didn't align the decimal points correctly

Answer

Jessica subtracted in the wrong order

Question 4

Emily was adding 5.23 and 7.89 and got 13.02. What error did Emily make in her calculation?

Accepted Answer

Emily added incorrectly, the correct answer is

7.75

Answer

Emily swapped the numbers

Answer

Emily subtracted instead of adding

Answer

Emily forgot to align the decimal points

Question 5

Tom subtracted 2.43 from 8.92 and got 7.59. What was the mistake in Tom's subtraction?

Accepted Answer

Tom subtracted incorrectly, the correct answer is

7.75

Answer

Tom added instead of subtracting

Answer

Tom forgot to align the decimal points

Answer

Tom swapped the numbers

Question 6

Lily added 4.56 and 3.74 and calculated the result as 8.20. What mistake did Lily make in her addition?

Accepted Answer

Lily added incorrectly, the correct answer is

7.75

Answer

Lily subtracted instead of adding

Answer

Lily swapped the digits after the decimal point

Answer

Lily forgot to add zero before the numbers

Question 7

Jake subtracted 7.85 from 15.60 and got 8.85. What error did Jake make in his subtraction?

Accepted Answer

Jake subtracted incorrectly, the correct answer is

7.75

Answer

Jake forgot to align the decimal points correctly

Answer

Jake swapped the numbers being subtracted

Answer

Jake added instead of subtracting

Question 8

Nina added 6.47 and 2.58 and got 8.95. What mistake did Nina make in her addition?

Accepted Answer

Nina added incorrectly, the correct answer is

7.75

Answer

Nina only added the whole numbers

Answer

Nina subtracted the numbers instead of adding

Answer

Nina misplaced the decimal point

Question 9

Sam subtracted 13.29 from 20.57 and ended up with 17.28. What mistake did Sam make in his subtraction?

Accepted Answer

Sam subtracted incorrectly, the correct answer is

7.75

Answer

Sam only subtracted the whole numbers

Answer

Sam aligned the decimal points incorrectly

Answer

Sam added the numbers instead of subtracting

Question 10

Alex added 9.34 and 4.56 and got 13.80. What mistake did Alex make in his addition?

Accepted Answer

Alex added incorrectly, the correct answer is

7.75

Answer

Alex ignored the decimal places

Answer

Alex misplaced the decimal point

Answer

Alex subtracted the numbers instead of adding

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