Multiplying by Powers of 10
34 x 1000
34,000
When adding decimals, what must you do with the decimal points?
Line them up
When multiplying decimals (such as 1.2 times 3) how do you know where to put the decimal in your answer?
Add up the number of decimal places in all the factors.
.7 x .4=
.28
Round the decimal to the given place-value. 5.031; hundredths
5.03
654 x 101
6540
4.9+3.0=
7.9
1.7 x 5 =
8.5
0.4 x 3.7 =
1.48
Round the decimal to the given place-value. 27.35; tens
30
34.36 x 100
3,436
7.2+9.5=
16.7
0.9 x 4 =
3.6
.52 x 2.1=
1.092
True or False:
When multiplying decimals, the amount of decimal places in your factors determines how many decimal places will be in your product.
True
607.53 x 103
607,530
.796+13
13.796
2.4 x 8 =
19.2
1.5 x 2.7 =
4.05
Ciera has four cats named Liam, Amy, Rose, and Sadie. The toy she wants to buy each cat costs $5.25. How much will Ciera spend if she buys all 4 of her cats this toy?
$21.00
5061.2 x 104
50,612,000
15.63+24.36=
39.99
.012 x 7 =
.084
.28 x .08 =
.0224
Avri spends 139.74 minutes a day talking to his friend Mason on the phone. How much time does Avri spend talking on the phone with Mason in ONE week?
978.18 minutes