Tutorpip← About this lessonABCDEHide the answer keyDownload PDF
Grade 2 · Set B · Side 1 of 2
Why that step is allowed
Scan to mark
on screen
B
Name
Date
Start Finish
Goal: 15 min for both sides
Score/ 10
Remember: A step is allowed when the amount stays the same.
1Why can 46 + 37 become 43 + 40?
You can add numbers in any order.Moving some from one number to the other keeps the total.Take a round number, then fix the extra after.
working
2Why can 13 + 48 become 11 + 50?
You can add numbers in any order.Take a round number, then fix the extra after.Moving some from one number to the other keeps the total.
working
3Why can 26 + 72 become 20 + 6 + 70 + 2?
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
4Why can 21 + 52 become 52 + 21?
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
5Why can 44 − 29 become 30 + 14 − 29?
Adding the same to both numbers keeps the gap the same.Ten ones make one ten.You can add numbers in any order.
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 1 to 5
Grade 2 · Set B · Side 2 of 2
Why that step is allowed
Scan to mark
on screen
B
Name
Date
Start Finish
Goal: 15 min for both sides
Score/ 10
6Why can 45 + 13 become 40 + 5 + 10 + 3?
Each number splits into its tens and its ones.Adding the same to both numbers keeps the gap the same.Ten ones make one ten.
working
7Why can 41 − 34 become 30 + 11 − 34?
You can add numbers in any order.Adding the same to both numbers keeps the gap the same.Ten ones make one ten.
working
8Why can 19 + 33 become 10 + 9 + 30 + 3?
Adding the same to both numbers keeps the gap the same.Ten ones make one ten.Each number splits into its tens and its ones.
working
9Why can 98 − 19 become 98 − 20 + 1?
Take a round number, then fix the extra after.Each number splits into its tens and its ones.Adding the same to both numbers keeps the gap the same.
working
10Can 44 + 27 become 41 + 30?
AllowedNot allowed
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 B
Why that step is allowed
1Moving some from one number to the other keeps the total.
2Moving some from one number to the other keeps the total.
3Each number splits into its tens and its ones.
4You can add numbers in any order.
5Ten ones make one ten.
6Each number splits into its tens and its ones.
7Ten ones make one ten.
8Each number splits into its tens and its ones.
9Take a round number, then fix the extra after.
10Allowed
Mark each answer, count the right ones and write the score on the sheet. Beat your own time next time.