Show:
SUBTRACTION
MULTIPLICATION
ROUNDING TO TENS
ROUNDING TO 100s
PROPERTIES
100

What is 25-5=?

5

100

What is 20x10=?

200

100

14

10


100

214

200

100

5+2=2+5

COMMUTATIVE

200

50-40=?

10


200

What is 11X5=?

55

200

28

30

200

520

500

200

(7+2)+3=7+(2+3)

ASSOCIATIVE

300

100-50=?

50

300

What is 12X10=?

120

300

63

60

300

410

400

300

5+0=5

IDENTITY

400

80-40=?

40

400

What is 6X4=?

24

400

189

190

400

850

900

400

52,546+0=52,546

IDENTITY

500

1,000-500=?

500

500

What is 6X7=?

42

500

158

160

500

963

1,000

500

789+987=987+789

COMMUTATIVE