Jill has 47 boxes of crayons. There are 8 crayons in each box. To estimate the total number of crayons she rounded 47 to the nearest 10 and then multiplied the new number by 8. What is her estimate?
400 crayons
100
When you compare numbers, what are you trying to do?
Find out if one number is greater than or less than another number.
300
John subscribed to 4 magazines. He got 6 issues of each magazine. He also bought 7 issues of different magazines. Which equation shows how many magazines John bought? 4 + 6 + 7 = 13 4 x 6 + 7 = 31 4 x 7 + 6 = 34 4 + 7 x 6 = 46
4 x 6 + 7 = 31 (4 magazines x 6 issues each + 7 extra)
400
Three students were comparing how many times they jumped on a trampoline. Jay jumped 345 times. Keisha jumped 356 times. Lee jumped more times than Jay but fewer times than Keisha. When each student's total was rounded to the nearest hundred, Jay's total and Lee's total were the same. Which of the following could be Lee's number? 305 347 350 362
347 (larger than Jay's total but rounds down to 300)
400
There are 8 players on the team. There are 4 girls on the team. What fraction of the players on the team are girls? 1/5 1/4 1/3 1/2
1/2 (because 4/8 is equivalent to 1/2)
400
There are 4 tables in Cleo's classroom. She puts 2 boxes of crayons on each table. Each package has 8 crayons. Write a problem to show how she could find the total number of crayons.
2 x 4 x 8 4 x 2 x 8 8 x 4 x 2
400
Dana has 3 coins in her pocket. No two coins have the same value. What is the least amount of money she could have?
16 cents (1 penny, 1 nickel, and 1 dime)
400
When you estimate you....
Round a number or numbers to make a problem easier to solve. You are finding an approximate answer or one that is close to the right answer.
500
Kelly is planting groups of seeds. She plants 4 seeds in each group. If she plants 22 groups of carrot seeds and 38 groups of lettuce seeds, how many total seeds does Kelly plant?
240 (22 + 38 = 60 x 4 = 240)
500
A map is drawn in the shape of a square. The map is then divided into parts. Each part has an area equal to 1/4 of the entire map. Each part is a rectangle but not a square. What could the map look like?
Square with three lines vertically or horizontally.
500
There are 3 gorillas living in the zoo. Each gorilla eats 40 pounds of food each day. The expression 3 x 7 x 40 represents the total amount of food that the gorillas eat in one week. Which of these other expressions would also represent the total amount of food? 3 x 47 7 x 43 28 x 40 120 x 7
120 x 7 (solve 40 x 3 first)
500
Kelly went to bed 30 minutes after 8:50. What time did she go to bed?
9:20
500
Match these key problem words to the operation or operations they signify. AND, TOTAL, EACH, DIFFERENCE, HOW MANY MORE, SPLIT UP, PRODUCT, QUOTIENT, SUM