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Multiples of 10
Mental Math to Multiply
Rounding to Estimate
Compatible Numbers
Multi-Step Problem Solving
100
Find the product of 30 X 29
What is 870
100
Multiply using mental math: 70 X 90
What is 6,300
100
Estimate each product. 34 X 52
What is 1,500
100
Estimate to find each product. USE COMPATIBLE NUMBERS when possible. 64 X 24
What is 1,200
100
Connor put 3 rows of pictures on a bulletin board. He placed 6 pictures in each row. Hunter put 4 rows of pictures on a different bulletin board. He placed 5 pictures in each row. How many more pictures did Hunter put on his bulletin board?
What is 2 pictures
200
Kellie used place value blocks to model 20 X 17. She used 20 tens blocks. How many ones blocks did she use?
What is 140
200
One centimeter is equal to 10 milliliters. If a photo is 10 centimeters long. How many millimeters long is the photo?
What is 100 milliliters.
200
Estimate the product of 57 X 49
What is 3,000
200
A company ordered 28 cartons of tape. Each carton contained 24 rolls. What is the best estimate of the total number of rolls of tape ordered?
What is 750 rolls of tape.
200
Ms. Hopler bought 4 dozen apples at Wegmans. The apples were equally divided into 6 bags. How many apples were in each bag?
What is 8 apples.
300
It takes 40 gallons of water to do a load of wash. How many gallons of water does it take to do 15 loads of wash?
What is 600
300
How many zeroes are in the product of 60 X 90? Explain how you know?
What is there are two zeroes, one from 60 and one from 90.
300
There are 14 rows of cars in a lot with 38 cars in each row. Which shows the best way to estimate how many cars there are all together? A. 10 X 30 B. 20 X 30 C. 10 X 40 D. 20 X 40
What is C
300
A toy store ordered 26 cases of barbie dolls. There are 21 barbie dolls in each case. What is the best estimate of how many barbie dolls the store ordered?
What is 500 barbie dolls
300
Salvatore has 35 pennies. His brother Joe has 37 pennies. They put all of their pennies together and placed them into 8 EQUAL stacks. How many pennies are in each stack?
What is 9 pennies
400
Ava is making 20 bracelets to sell at the fair. She needs 17 beads for each bracelet. How many beads does she need in all?
What is 340
400
Student A can type 40 words in one minute. Student B can type 30 words in one minute. How many words can student B type in 30 minutes?
What is 900 words
400
Describe how to use rounding to estimate the product of 38 X 42.
What is 38 rounds to 40 and 42 rounds to 40. I would then multiply 40 X 40 and get 1, 600.
400
Estimate to find the product. Use compatible numbers when possible. 46 X 19
What is 1,000
400
Together Mr. Cinelli and Ms. Hopler earned $72 washing cars. Ms. Hopler washed twice as many cars as Mr. Cinelli. If Mr. Cinelli washed 3 cars, how much did they charge to wash each car?
What is $8
500
The American Bison is the heaviest land mammal in North America. Bison live in groups of up to 20. How many bison could there be in 12 groups?
What is 240 bison
500
There are 30 players on each high school football team. Explain how you can find the total number of players if there are 40 teams.
What is multiply the number of teams by the number of players on each team; 30 X 40 = 1,200
500
Gennaro estimated 28 X 48 by finding 30 X 50. His estimate was 1,500, but he says the ACTUAL product will be greater than that amount. Is he correct? Explain how you know.
What is he is NOT correct. I know this because he rounded 28 to 30 and 48 to 50. The actual product will be less than the estimate because Gennaro rounded each number to a greater number.
500
A total of 42 people can ride the new coaster at Six Flags. What is the best way to estimate the number of people that ride the coaster in 26 rides?
What is 40 X 25
500
Ms. Swirski bought 2 sandwiches that cost $5 each. She also bought 3 salads that cost $4 each. She gave the cashier a $50 bill. How much change should Ms. Swirski get back?
What is $28