Estimating Sums and Differences Estimating Products and Quotients

Estimating Sums and Differences Estimating Products and Quotients Factors and GCF Multiples and GCM Prime and Composite Numbers 10 10 10 20 20 20 30 30 30 40 40 40 50 50 50

Estimating Sums and Differences questions follow

Question Find the sum. Check to see if your answer is reasonable by rounding to the nearest hundred. 475+ 382 = Estimating Sums and Differences 10

Answer 475 + 382 = 857 500 + 400 = 900 Estimating Sums and Differences 10

Question Find the difference. Check to see if your answer is reasonable by rounding to the nearest hundred. 836 – 487 = Estimating Sums and Differences 20

Answer 836 – 487 = 349 800 – 500 = 300 Estimating Sums and Differences 20

Question Do you need an estimate or an exact answer? Decide and then solve. Avin spent $13. 99 on a sweater, $6. 29 on a pair of socks, and $7. 98 on My Little Pony pajama pants. About how much money did he spend in all? Estimating Sums and Differences 30

Answer Estimate! $13 + $6 + $8 = About $27 in all. Estimating Sums and Differences 30

Question Do you need an estimate or an exact answer? Decide and then solve. A bottle contains 784 milliliters of milk. A family drinks 309 milliliters of milk at breakfast and the rest at dinner. How much did they drink at dinner? Estimating Sums and Differences 40

Answer Exact answer! 784 – 309 = 475 milliliters left Estimating Sums and Differences 40

Question Decide if you need an estimate or an exact answer. Then solve. Mrs. O’Connor wants to buy Mac a totally unnecessary gold-plated dog bowl. The dog bowl costs $857. Mrs. O’Connor has $325. About how much more money will Mrs. O’Connor need to buy the dog bowl? Estimating Sums and Differences 50

Answer Estimate! $900 - $300 = About $600 more Estimating Sums and Differences 50

Estimating Products and Quotients questions follow

Question Estimate the product: 42 x 4 = Estimating Products and Quotients 10

Answer What is 40 x 4 = 160? Estimating Products and Quotients 10

Question Estimate the product: 72 x 26 = Estimating Products and Quotients 20

Answer What is 70 x 30 = 2, 100? Estimating Products and Quotients 20

Question Estimate the product: 567 x 7 = Estimating Products and Quotients 30

Answer What is 600 x 7 = 4, 200? Estimating Products and Quotients 30

Question Estimate the quotient (this will be a bonus on the test!): 335 ÷ 8 = Estimating Products and Quotients 40

Answer What is 320 ÷ 8 = 40? Estimating Products and Quotients 40

Question Decide whether you need an estimate or an exact answer. Then solve. Mrs. Fickert buys 8 boxes of crayons for her class. Each box contains 64 crayons. About how many new crayons will the class get? Estimating Products and Quotients 50

Answer Estimate! 8 x 60 = About 480 new crayons Estimating Products and Quotients 50

Factors and GCF questions follow

Question List the factors of 24. Factors and GCF 10

Answer What are 1, 2, 3, 4, 6, 8, 12, 24? Factors and GCF 10

Question What is the sum of all the factors of 55? Factors and GCF 20

Answer What is 1 + 5 + 11 +55 = 72? Factors and GCF 20

Question Name the common factors of 12 and 18. Factors and GCF 30

Answer What are 1, 2, 3, 6? Factors and GCF 30

Question What is the GCF of 32 and 42? Factors and GCF 40

Answer What is 2? Factors and GCF 40

Question What is the GCF of 48 and 72? (Hint: The division method may help here. ) Factors and GCF 50

Answer What is 24? Factors and GCF 50

Multiples and GCM questions follow

Question What are the first 7 multiples of 4? Multiples and GCM 10

Answer What are 4, 8, 12, 16, 20, 24, 28? Multiples and GCM 10

Question Find a common multiple of 3 and 4. Multiples and GCM 20

Answer What is 12, 24, 36, etc. ? Multiples and GCM 20

Question What is the least common multiple (LCM) of 6 and 8? Multiples and GCM 30

Answer What is 24? Multiples and GCM 30

Question What is the least common multiple (LCM) of 6 and 9? Multiples and GCM 40

Answer What is 18? Multiples and GCM 40

Question Le. Sean Mc. Coy and Jeremy Maclin are running laps during practice. Mc. Coy finishes a lap every 4 minutes and Maclin finishes a lap every 3 minutes. If they start running at the same time, they will meet again at the finish line after finishing the _____th lap. (Hint: Think about common multiples)! Multiples and GCM 50

Answer What is the Multiples and GCM th 12 lap? 50

Prime and Composite Numbers questions follow

Question List the factors of 5. Is it a prime number? Prime and Composite Numbers 10

Answer What is 1, 5 – PRIME? Prime and Composite Numbers 10

Question List the factors of 9. Is it a prime number? Prime and Composite Numbers 20

Answer What are 1, 3, 9 – NOT PRIME? Prime and Composite Numbers 20

Question List the factors of 63. Is it a prime number or a composite number? Prime and Composite Numbers 30

Answer What are 1, 3, 7, 9, 21, 63 – COMPOSITE? Prime and Composite Numbers 30

Question List two prime numbers that are less than 20. Prime and Composite Numbers 40

Answer What are 2, 3, 5, 7, 11, 13, 17, 19? Prime and Composite Numbers 40

Question Explain why 1 is NOT a prime number or a composite number. Prime and Composite Numbers 50

Answer What is 1 has only one factor – 1! A prime number has exactly 2 factors – itself and 1. A composite number has more than two factors. Prime and Composite Numbers 50