Show:
Arrays and Multiplying
Multiplying by 10s and 100s
Breaking Apart to Multiply
Mental Math (Compensation)
Rounding
100

5 X 10

50

100

3 X 50

150

100

21 X 6

20 X 6      120

1 X 6            6

                126

100

4 X 19

add 1  (really 1 X 4)

adjust subtract 4

100

31 X 7

210

200

6 X 10

60

200

2 X 40 

80

200

34 X 4

30 x 4  120

4 X 4      16

            136

200

32 X 5

subtract 2 (really 2X5)

Adjust add 10

200

38 X 5

200

300

3 X 100

300

300

5 X 70

350

300

43 X 5

40 X 5    200

3 X 5        15

              215

300

31 X 8 

subtract 1 (really 1X8)

Adjust add 8

300

88 X 6

540

400

5 X 100

500

400

3 X 800

2,400

400

352 X 3

300 X 3   900

50 X 3     150

2 X 3           6

              1,056

400

603 X 3 

subtract 3 ( really 3X3)

Adjust add 9

400

473 X 3

1,500

500

8 X 100

800

500

600 X 9

5,400

500

226 X 7

200 X 7    1,400

20 X 7        140

6 X 7            42

              1,582

500

310 X 6

subtract 10 (really 10 X 6)

Add 60

500

488 X 6

3,000