4.1
There are 8 bags of pencil-top erasers for the school store. How many erasers are there in all if each bag has 100 erasers?
800
There are 47 apples in one basket. If 6 baskets have about the same number of apples, about how many apples are there in all?
about 300 apples
A toy store sells toy cars in packs of 320. A group of 8 friends wants to share one pack. How many toy cars will each friend get?
40
There are 95 stickers to share equally among 5 friends. About how many stickers will each friend get?
Hint: Find the compatible number/multiple of 5.
about 20 stickers per friend
You want to find 56 × 4 in your head. How can you break apart 56 to make it easier? Show your work and answer.
50 x 4 = 200
6 x 4 = 24
224
The fourth grade class is selling cookies for the school fundraiser. The cookies come in boxes of 9. If 2,000 boxes of cookies are sold, how many cookies did the fourth grade class sell?
18,000
A bakery makes 124 cupcakes each day. About how many cupcakes do they make in 8 days?
about 800 cupcakes
Ari has 2,000 marbles. He puts the same number of marbles in 5 bags. How many marbles are in each bag?
400
A total of 238 pencils need to be packed into boxes of 4. About how many boxes will be filled?
Hint: Find the compatible number/multiple of 4
about 60 boxes
You want to divide 84 ÷ 4 in your head. What’s a strategy to make it easier? Show your work and answer.
80 ÷ 4 = 20
4 ÷ 4 = 1
21
The school uses the money the have raised to buy 3 new basketball hoops. Each hoop costs $600 dollars. What is the cost for the 3 hoops?
$1,800
A factory produces 2,845 cans each day. About how many cans will it produce in 9 days?
about 27,000 cans
A printer needs to send 3,000 books to 6 libraries. Each library must get the same number of books. How many books should the printer send to each library?
500
A library has 1,760 books to put evenly on 9 shelves. About how many books will go on each shelf?
Hint: Find the compatible number/multiple of 9
About 200 books
You want to find 72 × 6 in your head. How can you break apart 72 to make it easier? Show your work and answer.
70 x 6 = 420
6 x 2 = 12
432
There are 6,000 people at a soccer game. Each game ticket costs $7. What is the amount of the ticket sales?
$42,000
Tickets to the carnival cost $7. The cashier sells 225 tickets in one hour. She says that the ticket sales in that hour were $950. Is this a reasonable estimate?
7 x 200 = 1,400
7 x 300 = 2,100
no, the estimate is not reasonable
A dairy farm produces 18,000 gallons of milk each week. The milk is stored in 6 separate tanks. Each tank holds the same amount. How many gallons are in each of the 6 tanks?
3,000
A farmer collects 4,675 eggs and wants to pack them into cartons that hold 6 eggs each. About how many cartons does he need?
Hint: Find the compatible number/multiple of 6
About 800 cartons
You want to divide 325 ÷ 5 in your head. What’s a strategy to make it easier? Show your work and answer.
300 ÷ 5 = 60
25 ÷ 5 = 5
65
Susannah makes bead necklaces for 11 of her friends. She uses 300 beads for each necklace. How many beads does she use for the 11 necklaces?
3,300
Jan wants to purchase 12 movie tickets that are $19 each. She rounds to the nearest ten and estimates that she will need $240. Is this a reasonable estimate?
20 x 12 = 240
yes, this is a reasonable estimate
A theatre has 27,000 seats in 9 sections. Each section has the same number of seats. How many seats are in each section?
3,000
A bus traveled 2,760 miles on 4 full tanks of gas. About how many miles does it travel per tank?
About 700 miles per tank
You want to divide 342 ÷ 6 in your head. What’s a strategy to make it easier? Show your work and answer.
300 ÷ 6 = 50
42 ÷ 6 = 7
57