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expanded -> standard form
expanded -> standard form CHALLENGING
skip counting
multiplication
subtraction
100

500+20+3

523

100

70,000+700+23

70,723

100

60,65,70,___,___,___

75,80,85

100

65 x 8 

520

100

923 - 759

164

200

60,000+3,000+200+80+1

63,281

200
800,000+5,000+800+20+12

805,832

200

10,12,14,___,___,___

16,18,20

200

87 x 9

783

200

504 - 178

326

300

100,000+50,000+5,000+300+10+8

155,318

300

400,000+80,000+9,000+52+26

489,078

300

180,190,200,___,___,___

210,220,230

300

123 x 4

492

300

700 - 345

355

400

600,000+7,000+300+3

607,303

400

3,000,000+500,000+40,000+810+80+6

3,540,896

400

678,688,698,___,___,___

708,718,728

400

26 x 99

2,574

400
9,008 - 1,265

7,743

500

900,000+80,000+20+3

980,023
500

8,000,000+70,000+9,000+100+45+7

8,079,152

500

1,235, 1,240, 1,245, ___, ___, ___

1,250, 1,255, 1,260

500

76 x 48

3,648

500

25,611 - 19,826

5,785