Number Lines
Place Value Blocks
Standard Algorithm
Surprise!
100

Solve using an open number line: 345-123=___

222

100
Solve by drawing place value blocks: 286-154=___

132

100

Solve using standard algorithm:

  897

- 435

--------

462

100

Solve by drawing place value blocks:396-173=___

223

200

Solve using an open number line: 451-227=___

224

200

Solve by drawing place value blocks: 426-274=___

152

200

Solve using standard algorithm:

  526

- 255

--------

271

200

Solve using an open number line: 771-543=___

228

300

Solve using an open number line: 624-389=___

235

300

Solve by drawing place value blocks: 534-265=___

269

300

Solve using standard algorithm:

  643

- 287

--------

356

300

Solve using standard algorithm:

  410

- 237

--------

137

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