All the Math we have Learned

Multiplying one-digit numbers

100

(3x3)x(2x1)

54

200

(3x3)x(2x4)

72

300

(3x3)x(3x3)

81

400

True or false: 8x5 is the same thing as 5+5+5+5+5+5+5+5+5

False

500

What is one way to represent 8x7 in addition

7+7+7+7+7+7+7+7

or

8+8+8+8+8+8+8

Multiplying two-digit numbers

100

40x10

400

200

11x10

110

300

20x40

800

400

70x80

5,600

500

25x56

1,400

Rounding

100

round 349 to the nearest hundred

300

200

round 2,480 to the nearest thousand

2,000

300

round 3,504 to the nearest hundred

3,500

400

round 54,566 to the nearest thousand

55,000

500

round 198,870 to the nearest hundred-thousand

200,000

Rounding and Adding

100

24+34=

20+30=50

200

478+297

800

300

4,543+7,309

12,000

400

43+78

120

500

23,464+6,404

26,000

Rounding and Multiplying

100

23x39

20x40

200

324x869

300x900

300

4,553x5,543

5,000x6,000

400

233x986

200x1,000=200,000

500

242x476

200x500=100,000