Show:
Rounding to 10
Addition
Multiply
Rounding to 100
Subtraction
100

356

360

100

123+156=n

279

100

What is 5 x 4 + 10

30

100

286

300

100

134 - 67=n

67

200

123

120

200

256+361=n

617

200

6 x 6 + 10

46
200

390

400

200

165 - 89= n

n=76

300

487

490

300

546+214=n

760

300

6 x 9 +15

69 

300

124

100

300

123- 72= n

n=51

400
103

100

400

209+143=n

352

400

10 x 6 + 45

105

400

586

600

400

167- 58 = n 

n=109

500

196

200

500

378 +141=n

519

500

5 x 7 +50

85

500

989

1000

500

187- 45= n

n-142