Round to 10s
Round to 100s
Estimation
Addition
Subtraction
100

Round to the nearest 10s place:

34

30

100

Round to the nearest 100s place:

432

400

100

Estimate and round to the nearest 10s:

32+47

30+50=80

About 80

100

76+32=

108

100

67-43=

24

200

Round to the nearest 10s place:

68

70

200

Round to the nearest 100s place:

575

600

200

Estimate and round to the nearest 10s:

82-43=

80-40=40

About 40

200

105+847=

952

200

74-36=

38

300

Round to the nearest 10s place:

126

130

300

Round to the nearest 100s place:

956

1,000

300

Estimate and round to the nearest 10s:

245+680=

250+680=930

About 930

300

768+423=


1,191

300

105-46

59

400

Round to the nearest 10s place:

895

900

400

Round to the nearest 100s place:

79

100

400

Estimate and round to the nearest 100s:

346-55=

300-100=200

About 200

400
Jack made 123 sandwiches for school lunches and Adrien has made 108 sandwiches. How many sandwiches have they made all together?

231 sandwiches

400
Mrs. Hill's class had 932 pencils in the pencil bin to start the year. Her class has used 148 pencils. How many do they have in the bin still?

932-148=784 pencils

500

Round to the nearest 10s place:

2,376

2,380

500

Round to the nearest 100s place:

3,998

4,000

500

Estimate and round to the nearest 10s:

2,406-937=

2,410-940=

About 1,470

500

Cassidy has walked 2,376 steps in a day, Annie has walked 4,280 steps in a day, and Allison has walked 3,502 steps in a day. If they were to combine all of their steps, how many would they have?

2,376+4,280+3,502=10,158 steps

500

Bjorn and Adam collected 5,432 crystals together. If Bjorn decides to give Bryna 45 crystals and Adam gives Bou 62 crystals, how many do they have left?

5,432-45=5,387

5,387-62=5,325

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