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Estimating Sums
Exponents
Adding Decimals
100
What is the estimate for 367+245?
400+250 ( or 450+ 200 or 450+250 )
100
10x10x10 = _____
10 to the power of 6
100
9.0+1.10 = ___
10.10
200
What is the estimate for 8,765-4,321
9,000- 4,000
200
10x10x10x10x10x10x10x10x10 = _____
10 to the power of 9
200
4.1+17.8 = ___
21.9
300
What is the estimate for 123,456,789+987,654,321? ( WITH ANSWER )
1,000,000,000+ 1,000,000= 1,100,000,000
300
10x10x10x10x10x10x10x10x10x10
10 to the power of 10 (HA HA)
300
24.56+65.98 = ______
90.54
400
What is the estimate for 96x42? ( WITH ANSWER )
100x40= 4,000
400
10x10x10x10x10x7 = _____
10 to the power of 5x7 ( OR 100,000 x 7 )
400
12.3+ 45.6
57.9
500
What is the estimate for 444x888? ( WITH ANSWER )
400x900= 360,000
500
10x10x10x10x10x10x10x10x1010x10x10x10x10x10x10x10x10 = ____
10 to the power of 18
500
24.56+65.98=90.54+34.72
125.26