Using Base-10 Blocks
Count-On
Count-Back
Decomposing
100

Draw base 10 blocks to solve 359-243

116

100

Use count-on strategy to solve 432-301

131

100

Use count-back strategy to solve 219-107

119

100

436 is the same as: 

4 Hundreds 

2 Tens

__ Ones

16 ones 

200

Draw base 10 blocks to solve 843-712

131

200

Use count-on strategy to solve 684-431

253

200

Use count-back strategy to solve 887-203

684

200

808 is the same as: 

____ Hundreds 

10 Tens

8 Ones

7 Hundreds 

300

Draw base 10 blocks to solve 579-342

237

300

Use count-on strategy to solve 769-526

243

300

Use count-back strategy to solve 138-113

25

300

378 is the same as: 

2 Hundreds 

__ Tens

8 Ones

17 tens

400

Draw base 10 blocks to solve 653-436

217

400

Use count-on strategy to solve 653-247

406

400

Use count-back strategy to solve 454-336

118

400

653 is the same as: 

6 Hundreds 

3 Tens

__ Ones

23 ones

500

Draw base 10 blocks to solve 345-257

88

500

Use count-on strategy to solve 531-369

162

500

Use count-back strategy to solve 968-389

579

500

271 is the same as: 

0 Hundreds 

__ Tens

1 Ones

27 Tens

M
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