Math unit 9

Mental Math (Add 10 or 100)

100

100 + 10 = ?

110

200

100 + 100 = ?

200

300

200 + 10 = ?

210

400

380 + 100 = ?

480

500

190 + 10 = ?

200

Use Base-Ten Models (Represent Addition)

100

124 = ? 

1 hundred + 2 tens + 4 ones

200

459 = ?

4 hundreds + 5 tens + 9 ones

300

992 = ?

9 hundreds + 9 tens + 2 ones

400

111 = ?

1 hundred + 1 ten + 1 one

500

8 hundreds + 5 tens + 2 ones = ?

852

Regrouping (Carrying)

100

10 ones = ?

1 ten

200

10 tens = ?

1 hundred

300

20 ones = ?

2 tens

400

50 tens = ?

5 hundreds

500

10 tens + 10 ones = ?

110

Decompose Both Addends (Partial Sums)

100

111 = ?

100 + 10 + 1

200

789 = ?

700 + 80 + 9 

300

999 = ?

900 + 90 + 9 

400

111 + 222 = ? 

100 + 200 + 10 + 20 + 1 + 2

500

679 + 345 = ? 

600 + 300 + 70 + 40 + 9 + 5 

Decompose One Addend (Flexible Strategy)

100

625 + 21 = ?

625 + 20 + 1

200

111 + 93 = ?

111 + 90 + 3 

300

278 + 88 = ?

278 + 80 + 8 

400

789 + 113 =? 

789 + 100 + 10 + 3

500

625 + 328 = ?

625 + 300 + 20 + 8