Mod. 5 Assessment Review

Subtraction with up to two decompositions

100

699 - 210 =

699 - 210 = 489

200

758 - 387 =

758 - 387 = 371

300

913 - 558 =

913 - 558 = 355

400

788 - 299 =

788 - 299 = 489

500

821 - 523 =

821 - 523 = 298

If..... then statements

100

If 762 - ______ = 173, then 173 + 589 = _______

Draw a number bond to represent the related facts

If 762 - 589 = 173, then 173 + 589 = 762

200

If 631 - ______ = 273, then _____ + 217 = 631

Draw a number bond to represent the related facts

If 631 - 358 = 273, then 358 + 273 = 631

300

If 541 - ______ = 378, then _____ + 378 = 541

Draw a number bond to represent the related facts

If 541 - 163 = 378, then 163 + 378 = 541

400

If 900 - ______ = 418, then _____ + 418 = 900

Draw a number bond to represent the related facts

If 900 - 482 = 418, then 482 + 418 = 900

500

If 700 - ______ = 376, then _____ + 376 = 700

Draw a number bond to represent the related facts

If 700 - 324 = 376, then 324 + 376 = 700

Simplified Strategy

100

Use the simplified strategy to solve 

500 - 219 = 

499 - 218 = 281

200

Use the simplified strategy to solve 

400 - 127 =

399 - 126 = 273

300

Use the simplified strategy to solve

300 - 178 =

299 - 177 = 122

400

Use the simplified strategy to solve 

500 - 286 = 

499 - 287 = 212

500

Jason said that a simplified strategy for 800 - 378 is 799 - 377. Solve both problems to show that Jason's strategy is correct

800 - 378 = 422 

799 - 377 = 422

Check your work using addition

100

274 - 76 = 

198 + 76 = 274

200

439 - 176 =

176 + 263 = 439

300

851 - 362 = 

362 + 489 = 851

400

542 - 174

174 + 368 = 542

500

729 - 471 = 

471 + 248 = 729 

Subtract across two zeros

100

200 -123 = _____

200 -123 = 77

200

600 - 432 = _____

600 - 432 = 168

300

700 - 543 = _____

700 - 543 = 157

400

800 - 409 = _____

800 - 409 = 391

500

900 - 606 = ______

900 - 606 = 294