The neighborhood mailman walks about 21 miles per week. Estimate the number of miles he walks in 6 weeks. Find the exact number of miles he walks in 6 weeks. Is your exact number reasonable?
20 x 6 = 120
21 x 6 = (20 x 6) + (1 x 6) = 126
The answer is reasonable.
100
6 x 8
48
200
60 x 8
480
200
18 x 6
18 x 6 = (10 x 6) + (8 x 6) = 108
200
58 x 7
60 x 7 = 420
200
Mr. Richardson has 67 sheets of stickers. There are 8 stickers on each sheet. Estimate the total number of stickers. Find the exact number of stickers. Is your answer reasonable?
70 x 8 = 560
67 x 8 = (60 x 8) + (7 x 8)= 536
The answer is reasonable.
200
7, 13, 18, 24, ___ , ___ , ___
30, 36, 42
300
400 x 7
2,800
300
27 x 5
27 x 5 = (20 x 5) + (7 x 5) = 135
300
301 x 9
300 x 9 = 2,700
300
A florist has 6 planting pots. Each planting pot has 45 seeds inside. Estimate the total number of seeds. Find the exact answer. Is your answer reasonable?
50 x 6 = 300
45 x 6 = (40 x 6) + (5 x 6) = 270
The answer is reasonable.
300
A B A C A B A C A B ___ ___ ___
A C A
400
60 x 5
300
400
2 x 89
2 x 89= (2 x 80) + (2 x 9) = 178
400
5 x 198
5 x 200 = 1,000
400
Paul glued sequins on his art project. He glued 9 rows with 34 sequins in each row. Estimate the product. Find the exact answer. Is your answer reasonable?
30 x 9 = 270
34 x 9 = (30 x 9) + (4 x 9) = 306
The answer is reasonable.
400
Which multiplication property says any number times 1 equals that number? Ex- 1 x 44 = 44
Identity Property
500
500 x 8
4,000
500
43 x 6
43 x 6 = (40 x 6) + (3 x 6) = 258
500
434 x 6
400 x 6 = 2,400
500
A fish store keeps 41 fish in each tank. There are 8 fish tanks. Estimate the total number of fish. Solve for the exact answer. Is your answer reasonable?
40 x 8 = 320
41 x 8 = (40 x 8) + (1 x 8) = 328
The answer is reasonable.
500
What is the relationship between the 7s in 377,092