Show:
Rounding
Estimate & Multiply
Missing Factor
Round & Add
100

Round 23 to the nearest ten

20
100

14X11=

100

100

5X____=100

20


100

15 + 23=? 

40

200

Round 536 to the nearest ten

540

200

29X22=

600

200

20X____=80

40

200

54 + 41= ?

90

300
Round 762 to the nearest hundred
800
300

42X21=

800

300

____X20=1,600

80

300

76 + 65= ? 

150

400

Round 2,493 to the nearest hundred

2,500

400

58X31=

1,800

400

____X40=

2,000

400

99 + 87= ?

190

500

Round 12,531 to the nearest thousand

13,000


500

44x38=

1,600

500

70X_____=490

7

500

Round to the nearest ten and add

144 + 321=

460