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Subtracting 10s
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Delimiter between question and answer:

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  • No column headers.
  • Each line maps to a question.
  • If the delimiter is used in a question, the question should be surrounded by double quotes: "My, question","My, answer"
  • The first answer in the multiple choice question must be the correct answer.

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Show 48 - 20 using place value blocks.
28
Count backwards from 100 to 10
100, 90, 80, 70, 60, 50, 40, 30, 20, 10!!!!
30 - 10 = ?
20
85 - 40 = ?
45
94 - 30 = ?
64
36 - 20 = ?
16
19 -10 = ?
9
-
38
Use addition to solve the subtraction problem.
70
Use addition to solve the subtraction problem.
30
96 - 10 Use mental math to solve. Write an addition equation to check your answer.
86, 86 + 10 = 96
67 - 10 Use mental math to solve. Write an addition equation to check your answer.
57, 57 + 10 = 67
53 - 10 Use mental math to solve. Write an addition equation to check your answer.
43, 43 + 10 = 53
Use an open number line to solve 86 - 60.
26
Use an open number line to solve 70 - 40
30
Choose the place value blocks to find the difference. 50 - 30 = ?
20
Use the partial hundred chart. What is 77-30?
47
Use the partial hundred chart. What is 70-20?
50
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