by powers of 10
1.45 x 10=
14.5
Is the decimal in the correct place?
3.21 x 4.1=13.161
Yes
4 x 3.2=
12.8
1.3 x 2.4
3.12
2.3 x 5.1
19.45 x 10^2
1,945
Is the decimal in the correct place in the answer?
9.21 x 3.56= 327.876
No, it should be: 32.7876
5 x 12.3
61.5
5.2 x 2.6
13.52
37.9 x 4.8
about 200
152.92 x 0.01
1.5292
Where should the decimal go in the answer?
5.6 x 4.2=2352
23.52
4.3 x 6
25.8
17.4 x 3.61
62.814
95.2 x 7.6
about 800
34.2 x 1,000
34,200
Where should the decimal go in the answer?
6.27 x 9.99= 626373
62.6373
8 x 7.6
60.8
6.08 x 9.4
57.152
0.78 x 540
about 500
9.821 x 0.001
.009821
Mr. V solved the following math problem like this. Is his answer correct? If not, what mistake did he make?
8.75 x 6.2= 5.4250
54.250
Jimmy bought 7 Irving running club t-shirts for 9.50. How much did he spend on Irving running club t-shirts? If he gave Ms. Fischer $70, how much change will he get back?
$66.50
$3.50
The carpet in the middle of the classroom is 24.3 inches long and 12.9 inches wide. What is the area of the carpet?
313.47 square inches
Mrs. Croasdale wanted to buy 3 copies of the new Diary of a Wimpy Kid book for 9.50 each. She brought $20 to school. Did she bring enough? If not, about how much should she have brought?
$30