Show:
Number Lines
Regrouping
Place Value Models
Partial Sums
100
Solve 143 + 25 using a number line. 

168

100

solve 137 + 335

472

100

draw place value blocks to solve: 136 + 220 

356

100

solve using partial sums: 451 + 121 =

572

200

Solve 213 - 155 with a number line. 

58

200

solve 156 - 61 =

95
200

draw place value blocks to solve: 589 - 264

325

200

solve using partial sums: 336 + 452 =

788

300

Solve 569 - 242 using a number line. 

329

300

solve 870 - 213 

657

300

draw place value blocks to solve: 660 - 145

515

300

solve using partial sums: 179 + 349

528