Powers of 10
7.43 × 102 =
743
Analyze the pattern. What is the missing number?
3.042 3.043 3.044 _______ 3.046 3.047
3.045
What is the sum?
0.38 + 7.5 + 10.36
𝖠 7.88
𝖡 11.49
𝖢 18.14
𝖣 18.24
𝖣 18.24
A department store sells 152 pairs of jeans for $29 each. Which is the best estimate of the total sales for the jeans?
A $3,000
𝖡 $3,500
𝖢 $4,000
𝖣 $4,500
𝖣 $4,500
Vocabulary:
What is the answer to an addition problem called?
sum
0.743 x 104 =
7,430
Compare the values of the digit 8 in the number 6,084 and in the number 9,821.
In 6,084, the value of the digit 8 is 80. In 9,821, the value of the digit 8 is 800, which is 10 times as much.
Sandra is 56.43 inches tall. On her fifth birthday, she was 43.27 inches tall. Which equation shows how much she has grown since her fifth birthday?
𝖠 56.43 + 43.27 = 99.70 inches
𝖡 56.43 - 43.27 = 13.16 inches
𝖢 43.27 - 56.42 = 13.16 inches
𝖣 43.27 + 56.42 = 99.70 inches
𝖡 56.43 - 43.27 = 13.16 inches
An auditorium has 29 rows of chairs with 115 chairs in each row. How many chairs does the auditorium have in all?
3,335 chairs; 29 × 115 = 3,335
Vocabulary:
What is the answer to a subtraction problem called?
difference
When multiplying a number by 105, how is the decimal point moved?
A 5 places to the right
B 5 places to the left
C 4 places to the right
D 4 places to the left
A 5 places to the right
Write <, >, or = to make the statements true.
a. 5 + 2.063 _____ 7 + 0.603
b. 200 + 93.1000 _____ 200.050 + 93
a. 5 + 2.063 < 7 + 0.603
b. 200 + 93.1000 > 200.050 + 93
Tyrel spent $3.37 on lunch. Daniel spent $5.09 on lunch. What was the total amount that the two boys spent on lunch?
$8.46
What is 1.24 × 0.9?
1.116
Vocabulary:
What is the answer to a multiplication problem called?
product
74.3 × 0.01 =
0.743
Find two numbers that round to 83.6 when rounded to the nearest tenth.
83.05 83.548 83.609 83.65 83.58 83.2
83.609
83.58
Which decimal makes the equation true?
30.34 + □ = 42.04
𝖠 11.7
𝖡 11.8
𝖢 12.3
𝖣 12.7
𝖠 11.7
Trina lives 4.2 miles from her school. Richard lives 0.75 times this distance from the school. How far from the school does Richard live?
3.15 miles; 4.2 × 0.75 = 3.15
Find the mistake:
104 = 10 x 10 x 10 x 10 = 40,000
It should be 10,000 not 40,000. The 4 is an exponent and tells us how many zeroes to put.
The number 0.06 is 1/10 of which decimal?
𝖠 0.006
𝖡 0.06
𝖢 0.6
𝖣 6.0
𝖢 0.6
Find two decimals that are equivalent to (5 × 102) + (3 × 1/100).
50.003 500.030 50.300 500.003 50.30 500.03
500.030
500.03
Brandon stands on a scale holding two boxes. The weight of Brandon and the boxes together is 61.56 pounds. Brandon’s weight without the boxes is 53.28 pounds. What is the combined weight of the two boxes that Brandon is holding?
8.28 pounds
Seth has some boards that are each 0.24 meter long. He places 6 of the boards end-to-end. What is the total length of the boards?
1.44 meters
Find the mistake:
1.5 x 103 = 0.0015
When we multiply, numbers get bigger. The decimal should have moved to the right not the left. The correct answer is 1,500.