Estimation Jeopardy

Rounding to the nearest 10

100

Round 18 to the nearest 10 

20

200

Round 24 to the nearest 10 

20

300

Round 46 to the nearest 10

50

400

Round 78 to the nearest 10

80

500

Round 93 to the nearest 10

90

Estimation Adding

100

Estimate 12 + 15

10+20=30

200

Estimate 25+15

30+20=50

300

Estimate 66+21

70+20=90

400

Estimate 89+12

90+10=100

500

Estimate 98+67

100+70=170

Estimation Subtraction

100

Estimate 13-10

10-10=0

200

Estimate 25-14

30-10=20

300

Estimate 58-43

60-40=20

400

Estimate 88-33

90-30=60

500

Estimate 99-56

100-60=40