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Estimating Products
Estimating Sums
Algorithms (10s 100s 1,000s)
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Place Value
100
22 X 48
20 X 50 = 1000
100
21 + 12
20 + 10 = 30
100
The average person drinks 22 glasses of milk in a month. About how many glasses of milk in that in a year?
100s
100
5 X 46
230
100
Which number is in the thousands place? 125,752,003
2
200
18 X 12
20 X 10 = 200
200
57 + 63
60 + 60 = 120
200
A full-grown oak tree loses an average of about 7 tons of water through it leaves per day. About how many tons is that per year?
1,000s
200
8 X 67
536
200
Which number is in the one hundred thousands place? 257,163,350,214
3
300
54 X 61
50 X 60 = 3000
300
96 + 72
100 + 70 = 170
300
A test found that a light bulb lasts an average of 63 days after being turned on. About how many hours is that?
1,000s
300
7 X 836
5,852
300
Which number is in the ten billions place? 974,500,203,001
7
400
8 X 12
10 X 10 = 100
400
374 + 962 + 488
400 + 1000 + 500 = 1900
400
Eighteen newborn hummingbirds weigh about 1 ounce. About how many of them does it take to make 1 pound?
100s
400
25 X 31
775
400
Which number is in the one hundred millions place? 256,417,632,014
4
500
57 X 95
60 X 100 = 6000
500
318 + 296 + 493
300 + 300 + 500 = 1100
500
The average dog drinks 10 gallons of water per week. About how many gallons is that in a month?
10s
500
4 X 329
1,316
500
Which number is in the ten millions place? 249,798,632,200
9