Multiplication Patterns (10, 100, 1000)
Division Patterns (10, 100, 1000)
Estimate Products
Estimate Quotients
Mental Math Strategies for Multiplication and Division
100

100 x 5

What is 500?

100

9,000 divided by 3

What is 3,000?

100

Estimate:

6 x 320

6 x 320 --> 6 x 300 

What is 1,800

100

Estimate:

78 divided by 4

78 divided by 4 --> 80 divided by 4

What is 20?

100

4 x 7 x 50

What is 1,400
200

9 x 60

What is 540?

200

320 divided by 8

What is 40?

200

Estimate:

4 x 2,160

4 x 2,160 --> 4 x 2,000

What is 8,000?

200

Estimate

624 divided by 3

624 divided by 3 --> 600 divided by 3
What is 200?

200

325 divided by 5

What is 65?

300

A store has 2,000 boxes of frozen yogurt bars for sale. Each box contains 4 bars. How many yogurt bars are for sale?

What is 8,000 bars?

300

Two friends split a $2,000 prize. How much money does each friend get?

What is $1,000

300

Greta has 4 rolls of tickets for the carnival. Each roll has 64 tickets. She says that she has about 245 tickets. Is she correct?

4 x 64 --> 4 x 60
What is 240 tickets? Yes Greta is correct.

300

Shannon has 1,880 energy bars to make welcome packets for summer camp. She puts 4 bars in each packet. She says that she can make about 470 welcome packets. Is that reasonable?

1,880 divided by 4 --> 1,600 divided by 4 OR 2,000 divided by 4

What is 400 or 500? Yeah...thats kinda reasonable.

300

Mei has 800 craft sticks for 4 projects. How many craft sticks can she use for each project?

What is 200 craft sticks?

400

A truck is carrying 3,000 boxes. Each box weighs 6 pounds. What is the weight of all the boxes?

What is 18,000 pounds?

400

Ari has 2,000 marbles. He puts the same number of marbles in each of 5 bags. How many marbles are in each bag?

What is 400 marbles?

400

Mr. Appleton has 6 science classes. Each class has 32 students. Mr. Appleton wants to give a sticker to each student. He has 175 stickers. Does Mr. Appleton have enough stickers? Use estimation to solve.

6 x 32 --> 6 x 30

What is 180 stickers? No he does not have enough.

400

The summer camp has tents that fit 5 campers each. The camp leader says they need 78 tents for 290 campers. Is this reasonable?

290 divided by 5 --> 300 divided by 5

What is 60 tents? No, 78 is too high.

400

Jordan makes 4 beaded necklaces. Each necklace has 36 beads. How many beads does Jordan use to make all the necklaces?

What is 144 beads?

500

Fill in the blank.

2 x 5,000 is the same as 2 x 5 thousands. 

6 x 7,000 is the same as 6 x __ thousands.

What is 7 thousands?

500

A printer needs to send 36,000 books to 6 libraries. Each library gets the same number of books. How many books does each library get?

What is 6,000 books?

500

A carnival has 9 rides. Each ride can carry 792 people each day. The manager says that about 5,818 people can ride each day. Is this reasonable?

9 x 792 --> 9 x 800

What is 7,200 riders? No that is not reasonable.

500

There are 147 days until summer camp! Jenna says that camp starts in 13 weeks. Is this reasonable?

147 divided by 7 --> 140 divided by 7

What is 20 weeks? No, this Jenna's guess is not reasonable.

500

A scientist counts 1,600 birds in an area covering 8 square miles. How many birds are in each square mile?

What is 200 birds?