Estimation
Estimate 396 x 7
What is 2800 or 4000
Multiply 34 x 52
What is 1,768?
Yousif has a collection of 34 Robucks cards. Nickaiya has 15 times as many Robucks than Yousif. How many Robucks does Nickaiya have?
What is 510
Which expression is greater, 93 x 103 or 11 x 104 ?
11 x 104
How many zeroes will there be in the product of 39 x 1,000?
3
Estimate 91 x 51
What is 4500
Multiply 78 x 47
What is 3,666
Felicia received a package of 394 stickers valued at $12 each. What is the total value of her package?
What is 4,728
Demetrius has 102 packages of sports cards. Each package has 28 cards. Use rounding to estimate. About how many cards does Demetrius have?
3,000
Vocabulary: Is 500 an underestimate or over estimate for the product of 12 and 53?
Underestimate
Estimate 17 x 63
What is 1200?
Multiply 89 x 27
What is 2,403?
Cherish has 214 bags of beads. Each bag of beads has 22 bracelets. She thinks that since 200 x 20 = 4,000 there are enough beads for 4,000 bracelets? Is she correct why or why not?
She is incorrect because even though 200 x 20 = 4,000 it would not be enough since 214 x 22 is 4,708 which is closer to 5,000 than 4,000
A theater can seat 540 people at one time. How may tickets are sold if the theater sells out every seat for one 30-day month?
16,200 tickets
Is 2,750 a reasonable answer for 917 x 33? Explain
No. Sample answer: if your round 917 to 900 and 33 to 30. The product is 27,000
Estimate 45 x 806
What is 40,000
Multiply 604 x 55
What is 33,220?
Nathaniel has 879 songs on her Ipad. Samoya has 11 times as many songs on her Ipad. How many songs does Samoya have?
What is 9,669?
Malachi estimates the product 257 x 29 is less than 6,000. Athena disagrees. She estimates the product is more than 7,000. Whose estimate is better? Explain your thinking.
Athena's estimate is better. Sample answer: The product is more than 7,000 since 250 x 30 =7,500.
Yasire's organization chooses 34 schools and gives each one 432 free laptops. How many free laptops does the organization give away?
14,688 laptops.
Estimate 37 x 88
What is 3600?
Multiply 787 x 23
What is 18,101?
There are 36 large fish tanks at the zoo. Each tank holds 205 gallons of water. How many gallons of water would it take to fill all of the tanks?
What is 7,380?
When you multiply a 3-digit number by a 2-digit number, what is the greatest number of digits the product can have? Explain.
5. Sample answer 999 x 99 are the greatest 3-digit and 2-digit numbers. Their product has 5 digits, so no other product of a 2-digit and a 3-digit could have more digits.
Gwendolyn has 102 stamps. Anthony has twice as many stamps as Gwendolyn. Willimyer has twice as many stamps as Anthony. How many stamps do they have in all?
714