eQuizShow
Decimal Multiplication/Unit 4
Multiply Me Baby
Question: 400 X 80
Answer: 32,000
Question: 53 X 100
Answer: 5,300
Question: 20 X 300
Answer: 6,000
Question: 30 X 0.1
Answer: 3
Question: 0.04 X 10
Answer: 0.4
Potpourri
Question: What is the square root of 36?
Answer: 6
Question: At a school supply store, the cost of two pencils is $0.25. If the storeowner pays $0.06 for each pencil, how much profit is earned if a shopper spends $3 for pencils?
Answer: $1.56
Question: Round 0.076 to the nearest tenth.
Answer: 0.1
Question: True or False? Super Bowl 49 represented in roman numerals looks like this: XLIX
Answer: True! Darn those Cardinals. :(
Question: Puzzled Penguin is having an Otter Pop party for his friends in the North Pole (how ironic:). He needs to buy 10 packages of them. Each package at Fryze (get it? freeze combined w/Fry's?:) costs $6.78. How much money will he have to take out of his account at Bank of the North Pole?
Answer: $67.80
~ About (Estimation)
Question: Is 18,000 a reasonable estimate for the problem: 5, 842 X 3?
Answer: Yes, because the exact answer is 17, 526. Your factors could have been estimated to 6,000 and 3.
Question: True or False? A good estimate for 413 X 6 is 400 X 6?
Answer: True
Question: True or False? This symbol (~) refers to estimates.
Answer: True
Question: 8.7 X 3 ~ 207: True or False?
Answer: False!!!!! 8.7 should be rounded to 9, and the 3 factor should be left alone to estimate the product. 9 X 3 = 27, which would be a reasonable estimate.
Question: Estimate the product for 4.8 X 0.7. Then solve for an exact answer and compare. What do you get?
Answer: 5 and 3.36
I Have Problems!!
Question: When you multiply 64.3 by 0.1, is the answer greater or less than 64.3? Explain your answer.
Answer: Less Than!! When you multiply by 0.1, it's the same as dividing by 10. The product is only a part of the factor 64.3.
Question: Each student collected 78 aluminum cans. There are 24 students in the class. How many cans did the class collect?
Answer: 1,872 cans
Question: Max collected 80 aluminum cans. If the typical weight of an aluminum can is 14.2 grams, how much did his cans weigh altogether?
Answer: 1,136 grams
Question: Explain how you know how many zeros will be in the product of 60 X 50?
Answer: There will be three zeros. Two zeros are there because there are a total of two zeros in the factors. The third zero is part of the product of the basic fact: 6 X 5.
Question: How is multiplying 0.3 by 10 like multiplying 0.3 by 0.1? AND how is it different?!
Answer: They are alike because multiplying 0.3 by 10 or by 0.10 results in a shift of one place. They are different because the digits shift in opposite directions and when multiplying 0.3 by 0.1, a zero place holder must be written in the tenths place.
You Are Square
Question: 10 is squared. True or False? This means that 2 is multiplied 10 times.
Answer: False! 10 is multiplied by itself twice.
Question: 5 is cubed. True or False? This means that the number 5 is the exponent.
Answer: False. The exponent is a 3. 5 is multiplied by itself 3 times if it is cubed.
Question: 4 "to the 7th power": True or False? The exponent is a 7, and the base that is being multiplied by itself seven times is the number 4.
Answer: True!!!!!!! :)
Question: 56 X 10 cubed = 56,000 True or False?
Answer: True!!!
Question: 427 X 10 squared = x
Answer: x = 42,700