Grade 2 Math Practice Test: Adding and Subtracting 10 and 100 in Your Head
- Mentally Adding and Subtracting 10 and 100
- 10 questions
- 12 minutes
Adding or subtracting 10 changes the tens digit. Adding or subtracting 100 changes the hundreds digit. The other digits stay the same.
Tap an option to mark your answer. You can change your mind, or tap the same option again to leave the question blank. The correct answers and explanations appear when you finish the test.Tap an option to answer; tap it again to leave the question blank.
Your result
- 0 correct
- 0 wrong
- 0 blank
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Question 1
What number is 10 more than 345?
Correct answer: C
10 more changes the tens digit from 4 to 5, so the number is 355. The answer 445 is 100 more.
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Question 2
What number is 100 less than 812?
Correct answer: A
100 less changes the hundreds digit from 8 to 7: 712. The answer 802 is only 10 less.
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Question 3
What number is 10 less than 400?
Correct answer: D
400 is 40 tens, and 1 ten less is 39 tens, which is 390. The answer 300 takes away 100 instead of 10.
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Question 4
What is 467 + 100?
Correct answer: B
Adding 100 makes the hundreds digit go from 4 to 5: 567. The answer 477 adds only 10.
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Question 5
What is 530 − 10?
Correct answer: A
Taking away 10 lowers the tens digit from 3 to 2: 520. The answer 529 only takes away 1.
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Question 6
What number is 10 more than 990?
Correct answer: D
990 is 99 tens, and one more ten makes 100 tens, which is 1,000. The answer 1,090 adds 100 instead of 10.
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Question 7
What number comes next in this pattern?
258, 268, 278, ___
Correct answer: C
Each number is 10 more than the one before, so 278 + 10 = 288. The answer 279 only adds 1.
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Question 8
Zoe adds 100 to 274. Which digit changes?
Correct answer: B
274 + 100 = 374, and only the hundreds digit changes from 2 to 3. The tens and ones digits stay 7 and 4.
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Question 9
Jen had 650 points in a game. She lost 100 points and then won 10 points. How many points does Jen have now?
Correct answer: A
650 − 100 = 550, and 550 + 10 = 560. The answer 540 subtracts the 10 instead of adding it.
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Question 10
Which number makes this true?
___ + 100 = 703
Correct answer: C
The missing number is 100 less than 703, so it is 603. Check: 603 + 100 = 703. The answer 803 adds 100 instead of taking it away.
Questions you leave blank are not counted as wrong.
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