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3-Digit Math Challenge

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3-Digit Math Challenge

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About this activity

Timed add/sub with 3-digit numbers

Created by

Shelly Jain
Shelly Jain
India

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3-Digit Math Challenge
 

3-Digit Math ChallengeOnline version

Timed add/sub with 3-digit numbers

by Shelly Jain
1

235 + 164 = ?

2

512 - 273 = ?

3

318 + 457 = ?

4

604 - 289 = ?

5

149 + 386 = ?

6

753 - 421 = ?

7

268 + 487 = ?

8

980 - 457 = ?

9

312 + 587 = ?

10

765 - 248 = ?

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Adding the hundreds and ones places gives 2+1=3 hundreds and 3+4=7 tens, totaling 399.

Subtract 273 from 512; borrow as needed to get 239.

3+4=7 hundreds; 18+57=75; total 775.

Borrow from the hundreds: 6-2=3 hundreds; 04-89 requires borrow to 315.

1+3=4 hundreds; 49+86=135; 400+135=535.

Subtract 421 from 753 to get 332.

2+4=6 hundreds; 68+87=155; total 755.

Borrow as needed: 0-7 cannot; becomes 10-7=3 in units, etc., giving 523.

3+5=8 hundreds; 12+87=99; total 899.

7-2=5 hundreds; 65-48=17; total 517.

 
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