Multiplying by 10, 100 or 1000
Estimating
Models
Multiply Decimal by Whole Number
Multiplying 2 Decimals
Multiple Step Problems
100
What is 0.76 x 103?
760
100
Which of the following provides the best estimate of the product of 59 x 0.19?
A. 100 x 0.15 =15
B. 60 x 0.2 = 12
C. 60 x 0.1 = 6
D. 70 x 0.2= 14
B. 60 x 0.2= 12
100
What expression does this decimal model show?
A. 0.08 x 0.03
B. 0.8 x 0.3
C. 0.7 x 0.2
D. 0.4 x 0.6
B. 0.8 x 0.3
100
Lucia scored an 8.65 on her first gymnastics event at a meet. If she gets the same score on each of the four events, what will be her total score?
34.6
100
A farmer plants 0.4 of a field with wheat. The field is 3.45 acres in size. How many acres are planted with wheat?
1.38 acres
100
Mrs. Delgado needs to buy 160 begonias for her flowerbed. At the prices shown, how much would she save if she bought them by the flat instead of buying them sepa
rately?
$46.40
200
What is 0.42 x 102?
42
200
Estimate the product of 204 x 0.46. Explain what method of estimation you used and why it works.
200 x 0.5 = 100 Take half of 200 to estimate because 0.5 is the same as half.
200
Kendall worked 25.5 hours one week. If he earns $12.50 per hour, how much did he earn that week? How did you know where to put the decimal point?
$318.75- I had to move the decimal in 3 places because I had to move it out 3 placed in the original problem.
200
Antoinette buys 6lbs of tangerines. She pays with a $10 bill. How much did she spend? How much change does she receive?
6 x 1.19= $7.14
$10.00 - $7.14 = $2.86
200
Sue bought 4.6 meters of fabric that costs $3.57 per meter. What was her total cost?
$16.42
200
Al and Barb each go to the store to buy school supplies. Al buys 11 colored pencils for $0.69 each and Barb buys 3 packs of folders for $2.70 per pack. Who spent more at the store? Explain?
Barb spent more at the store because her total came out to $8.10 and Al only spent $7.59.
300
Mario is buying oranges from the stand. He buys 4 lbs. Estimate how much he spends. Is your estimate an underestimate or overestimate? Explain.
1.69 x 4
2.00 x 4 = $8 - over estimate because I rounded the price up.
300
Alyssa is painting her bedroom blue. Each of four walls has dimensions of 12.9 ft by 11.1 ft. How much area will she paint?
572.76 ft
400
Nico buys 3lbs of lemons and 4lbs of apples. How much does he spend in all? Write and solve an equation.
(3 x 2.49) + (4 x 1.29)
7.47 + 5.16= $12.63