Add with & without Decimals
Add the following numbers: 6,201 + 5,929
12,130
Subtract the following numbers: 4,201 - 2,810
1,391
Multiply the following numbers: 19 x 14
266
Estimate the product of the following numbers: 459 x 9
500 x 10 = 5,000
OR
500 x 9 = 4,500
Susan is creating lanyards for her teachers. Each lanyard needs 1.8 yards of yarn. At the store, yarn is sold by the yard. If Susan wants to make 48 lanyards, how many yards of yarn does she need to buy?
1.8 x 48 = 86.4
Susan needs to buy 87 yards of yarn in order to have enough for ALL of the lanyards.
Add the following numbers:10,953 + 4,871
15,824
Subtract the following numbers: 12,049 - 5,721
6,328
Multiply the following numbers: 47 x 13
611
Estimate the product of the following numbers: 907 x 5
900 x 10 = 9,000
OR
900 x 5 = 4,500
John is building a fence. Each post needs to be 1.5 meters tall. At the store, the wood for the post is sold by the meter. If John needs 97 fence posts, how many meters of wood does John need?
1.5 x 97 = 145.5 meters
John would need to buy 146 meters of wood to make ALL of the posts.
Add the following numbers: 45.821 + 12.473
58.294
Subtract the following numbers: 4.913 -1.781
3.132
Multiply the following numbers: 8.76 x 17
148.92
Estimate the product of the following numbers: 43.76 x 17
40 x 20 = 800
Susan needs 87 yards of yarn to make lanyards for her teacher. The yarn is sold at $0.15 per yard. What is the total cost of the yarn in dollars? Explain your reasoning & your placement of the decimal point.
87 x $0.15 = $13.05
I multiplied the number of yards of yarn Susan needs (87) by the cost of each yard of yarn ($0.15). This gave me my total of $13.05. The decimal was placed in between the 3 and the 0, which left two digits behind the decimal point. I know my decimal point goes there because there were two digits behind the decimal point in my factors, so it has to be the same for my product.
Add the following numbers: 27.206 + 9.917
37.123
Subtract the following numbers: 9.35 - 0.385
8.965
Multiply the following numbers: 17.06 x 2.5
42.65
Estimate the product of the following numbers: 53.91 x 2.3
50 x 2 = 100
John needs 146 meters of wood to make posts for a fence. The wood is sold at $0.30 per meter. What is the total cost of the wood in dollars? Explain your reasoning & your placement of the decimal point.
146 x $0.30 = $43.80
I multiplied the number of meters of wood John needs (146) by the cost of each meter of wood ($0.30). This gave me my total of $43.80. The decimal was placed in between the 3 and the 8, which left two digits behind the decimal point. I know my decimal point goes there because there were two digits behind the decimal point in my factors, so it has to be the same for my product.
Add the following numbers: 45.9 +7.028
52.928
Subtract the following numbers: 7.04 - 4.291
2.749
Multiply the following numbers: 20.64 x 3.2
66.048
Estimate the product of the following numbers: 87.34 x 7.5
90 x 8 = 720
A company is competing with Susan's lanyard business. Susan made 48 lanyards for her teachers, using around 87 yards of yarn. The company wants to sell 100 times as many lanyards as Susan. Write an expression using exponents to show how many yards of yarn the company will need. You do NOT need to calculate the total.
87 x 102