Review #1
What number is 10 times as great as 5,000?
50,000
9 x 15 = 15 x 9
What property is shown above?
Commutative Property of Multiplication
Estimate the sum by rounding to the nearest whole number:
23.08 + 59.79
83
Find the product: 20 x 400
8,000
Solve: 42 x 103
42,000
4 x 103 = ?
4,000
3 x 12 = (3 x 10) + (3 x 2)
What property is shown above?
Distributive Property
I estimate the sum of 32.5 and 41.8 and get 700. Is my answer reasonable?
No!
Estimate the product by rounding to the nearest ten:
29 x 98
3,000
Solve: 42 x 0.1
4.2
Write 0.009 as a fraction.
9 / 1,000
Solve:
6 x (5 - 3) + 1
13
Subtract: 18.93 - 7.66
11.27
Multiply: 365 x 5
1,825
Solve: 42 x 0.01
0.42
Write the following in standard form:
"four and nine hundred eight thousandths"
4.908
Write the following as an expression:
"Add 54 and 97, then multiply by 2."
(54 + 97) x 2
Add: 7.31 + 4.16 + 9
20.47
Multiply: 36 x 14
504
I estimate 2.7 x 9.8 by rounding my numbers to get the following expression: 3 x 10.
Will my answer be an overestimate or an underestimate?
Round 3.72 to the nearest tenth.
3.7
Write the following as an expression:
"Multiply the sum of 35 and 28 by the sum of 3 and 4."
(35 + 28) x (3 + 4)
You have $12.5. You earn $5.25 more for doing chores. Then you buy a video game for $7.75. How much do you have left?
$10
I estimate 21 x 48 and get 1,000. Is my answer reasonable?
Yes!
How would I express "0.4 x 3" using repeated addition?
0.4 + 0.4 + 0.4