Mental Math: Estimate
Explain how 32 divided by 4 can help you solve 320 divided by 7.
I know 32 divided by 4 is 8, so 320 divided by 4 would be 80.
What are the 3 things a remainderaffects our answer?
add 1 to quotient, "ignore it", or remainder is the answer
How many groups of 4 are in 48?
12
Draw a picture to explain why 423 divided by 3 is 141.
See boards
Fill in the missing blank for each statement:
________ divided by 7 equals 70
________ divided by 4 equals 800
490 and 3,200
Samuel has 85 prize tickets, and a marble costs 7 tickets. How many marbles can he get?
12 Marbles
How many groups of 6 are in 90?
15
The art teacher displayed 48 paintings on 3 walls. If each wall had the same number of paintings, how many are on each wall?
16 paintings
Mrs. Gall orders 240 folders and divides them equally among 3 classes. How many folders does each class get?
80 folders
Dave is packing 23 sweaters into boxes. Each box holds 3 sweaters. How many boxes will Dave need?
8 Boxes
What is 450 divided by 8?
56R2
how can you divided 176 magazines equally into 5 boxes?
35 magazines with 1 left over
What compatible numbers can you use to estimate 132 divided by 6? Why is rounding not a good way to estimate here?
Two compatible numbers would be 120 and 6. Rounding would not be a good way to estimate because 132 rounded is wither 130 or 100, and neither is divisible by 6.
Alex has 55 baseball cards. Each page in his binder holds 4 cards. How many cards are on the last page?
3 cards on the last page
Hillary has 254 tokens for games at Pizza Mania. She would like to use an equal number of tokens for each of the 3 visits she has planned. Will Hillary be able to use the same number of tokens for each visit?
No, 254 divided by 3 is 84R1, so she would use 84 tokens on two trips and 85 on one.
Zelda has a piece of fabric that is 74 inches long. She wants to divide it into 2 equal groups. What is the length of each piece?
37 inches
Complete all 3 problems using mental math (estimate):
430 divided by 9
138 divided by 5
625 divided by 3
about 50, about 30, about 210
Amanda calculated that 34 divided by 8 equals 3R10. Is this correct, if not why is it incorrect and what would the correct answer be (NO MATH)?
She is incorrect because her remainder is larger than her divisor, the correct answer would be 4R2.
What is the quotient for 3,858 divided by 8?
482R2
Find the quotient of 417 divided by 8?
52R1