Multiply!
7 x 0.3 = y
y = 2.1
What place value does the 8 represent in 182?
Tens place
Can I write these two equations and get the same answer?
10 x 8 = 80
8 x 10 = 80
Yes
A rectangle has a length of 21.5 inches and a width of 3.25 inches. What is the PERIMETER? Write an equation and solve.
(Hint: draw it out)
21.5 + 21.5 + 3.25 + 3.25 = y
or
(21.5 x 2) + (3.25 x 2) = y
y = 49.5 inches
13.2 + 4.81 = y
18.01
1.4 x 104
14,000
What place value does the 5 represent in 132.05?
Hundredths place.
Can I write these two equations and get the same answer? Why or why not?
10.3 x 100 = z
10.3 x 103 = z
No; 103 is the same as multiplying by 1000, not 100.
A rectangle has a length of 21.5 inches and a width of 3.25 inches. What is the AREA? Write an equation and solve.
21.5 x 3.25 = y
69.875 in2
List two ways you can rewrite 8/10 as a decimal.
0.8, 0.80, 0.800
8.3 x 6.4 = y
y = 53.12
Jane wants to use partial products to solve 6 x 0.47. Is her work correct?
(6 x 0.4) + (6 x 0.7)
No; she would need to do
(6 x 0.4) + (6 x 0.07)
Can I write these two equations and get the same answer? Why or why not?
14.7 x 0.1 = w
14.7 x 1/10 = w
Yes; 0.1 and 1/10 are equal.
Sarah and Beth have the same-sized rooms. Their rooms are 10.5 ft by 12.6 ft. What is the AREA of their rooms combined?
264.6 ft2
341 x 0.1 = z
34.1
4.5 x 16.5 = z
What was his estimating error? What would be a better estimate?
He rounded $26.90 to $20, which is too low. A better estimate could be found by rounding to $25 or $30.
$100 or $120 would be better estimates.
Can I write these two equations and get the same answer? Why or why not?
989 x 5/10 = y
989 x 50/100 = y
989 x 0.5 = y
Yes; 5/10, 50/100, and 0.5 are all equal.
Marco gets paid $14.90 an hour at his job. He worked for 8 hours on Saturday. How much money did Marco make that day?
Write an equation and solve.
(Hint: make sure your answer looks like money!)
8 x 14.90 = y
$119.20
List two ways you can rewrite 0.3 as a fraction.
3/10, 30/100, 300/1000