Powers of 10
2.3 x 103
2,300
Estimate 4.2 x 10.89
4 x 11 = 44
0.6 x 0.8
0.48
0.5 x 5
2.5
Pokemon cards cost $2.95 per pack. If Alex buys 5 packs, about how much does he spend?
3 x 5 = $15
6.8 x 104
68,000
Estimate 9.7 x 66
660 or 700
1.7 x 3.9
6.63
7 x 0.4
2.8
A recipe calls for 0.25 cups of sugar per serving. If you are making 8 servings, how much sugar do you need?
(0.25 \times 8 = 2). You need 2 cups of sugar.
340,000
Find the missing product
1.4 x 99 = _______
14 x 99 = 1,386
138.6
2.7 x 3.5
9.45
1.1 x 3
3.3
A bottle of juice contains 1.2 liters. If you buy 4 bottles, how many liters of juice do you have in total?
(1.2 \times 4 = 4.8). You have 4.8 liters of juice in total.
2.89 x 104
28,900
Find the missing product
2.4 x 4.5 = 10.8
24 x 4.5 = ______
108
4.2 x 0.9
3.78
0.8 x 0.9
0.72
A car travels 0.75 kilometers in one minute. How far will it travel in 6.5 minutes?
(0.75 \times 6.5 = 4.875). The car will travel 4.88 kilometers.
4.5 x 103 and 45 x 102
Find the missing product
6.3 x 2.3 = ______ (a)
63 x 2.3 = ______ (b)
63 x 23 = 1,449
a. 14.49
b. 144.9
2.32 x 0.71
1.6472
0.12 x 0.3
0.036
Sarah bought 3.5 meters of string to make bracelets. Each meter costs $2.75. How much did Sarah spend on the string?
Solution: (3.5 \times 2.75 = 9.625). Sarah spent $9.63 on the string.