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Grade 2 · Set A · Side 1 of 2
Why that step is allowed
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A
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Goal: 15 min for both sides
Score/ 10
Remember: A step is allowed when the amount stays the same.
1Why can 35 + 38 become 38 + 35?
Each number splits into its tens and its ones.Take a round number, then fix the extra after.You can add numbers in any order.
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2Why can 21 + 48 become 48 + 21?
Each number splits into its tens and its ones.You can add numbers in any order.Take a round number, then fix the extra after.
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367 + 19 = 70 + 16. Why can 70 + 16 become 80 + 6?
Adding the same to both numbers keeps the gap the same.You can add numbers in any order.Ten ones make one ten.
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4Why can 25 + 39 become 24 + 40?
Moving some from one number to the other keeps the total.Take a round number, then fix the extra after.You can add numbers in any order.
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5Why can 27 + 36 become 36 + 27?
Take a round number, then fix the extra after.Each number splits into its tens and its ones.You can add numbers in any order.
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Scan the code at the top to mark this sheet on screenTake a photo of your answers or type them. It is marked for you automatically, and your score is kept.
Tutorpip · tutorpip.com · Problems 1 to 5
Grade 2 · Set A · Side 2 of 2
Why that step is allowed
Scan to mark
on screen
A
Name
Date
Start Finish
Goal: 15 min for both sides
Score/ 10
6Why can 15 + 79 become 15 + 80 − 1?
Moving some from one number to the other keeps the total.Take a round number, then fix the extra after.Adding the same to both numbers keeps the gap the same.
working
7Why can 19 + 45 become 45 + 19?
Each number splits into its tens and its ones.Take a round number, then fix the extra after.You can add numbers in any order.
working
8Why can 39 + 13 become 30 + 9 + 10 + 3?
Ten ones make one ten.Adding the same to both numbers keeps the gap the same.Each number splits into its tens and its ones.
working
9Why can 13 + 39 become 10 + 3 + 30 + 9?
Ten ones make one ten.Each number splits into its tens and its ones.Adding the same to both numbers keeps the gap the same.
working
10Why can 51 + 19 become 51 + 20 − 1?
Moving some from one number to the other keeps the total.Adding the same to both numbers keeps the gap the same.Take a round number, then fix the extra after.
working
Scan the code at the top to mark this sheet on screenTake a photo of your answers or type them. It is marked for you automatically, and your score is kept.
Tutorpip · tutorpip.com · Problems 6 to 10
Answer key · Grade 2 · Set A
Why that step is allowed
1You can add numbers in any order.
2You can add numbers in any order.
3Ten ones make one ten.
4Moving some from one number to the other keeps the total.
5You can add numbers in any order.
6Take a round number, then fix the extra after.
7You can add numbers in any order.
8Each number splits into its tens and its ones.
9Each number splits into its tens and its ones.
10Take a round number, then fix the extra after.
Mark each answer, count the right ones and write the score on the sheet. Beat your own time next time.