Review for Topic 3 Quiz

Round to the nearest 10

100

23

20

200

57

60

300

76

80

400

92

90

500

17

20

Adding tens to a 2 digit number

100

41+30=

41,___,____,____

41+30=71

200

46+20=

46,____,____

46+20=66

300

29+30=

29,___,____,_____

29+30=59

400

53+40=

53+40=93

500

53+20=

53+20=73

Estimate the sum to the nearest 10

100

Estimate:

43+26=

40+30=70

200

Estimate:

23+37=

20+40=60

300

Estimate:

29+33=

30+30=60

400

Estimate:

52+12=

50+10=60

500

Estimate:

37+32=

40+30=70

Estimate the difference to the nearest 10

100

Estimate:

38-26=

40-30=10

200

Estimate:

33-21=

30-20=10

300

Estimate:

88-32=

90-30=60

400

Estimate:

57-14=

60-10=50

500

Estimate:

81-28=

80-30=50

Subtracting tens to a 2 digit number

100

75-20=

75, 65,____

75-20=55

200

67-40=

67,___,____,_____,_____

67-40=27

300

56-20=

56-20=36

400

71-30=

71-30=41

500

98-60=

98-60=38