Vocabulary
Double-by-Single
Multi-Digit Multiplication
Problem Solving
Double-by-Double
100
The number of square units inside a rectangle

area

100

85 x 6

510

100

123 x 6

738

100

Mr. Wu has 5 cartons of black ink and 4 cartons of color ink.  Each carton contains 48 cartridges.  How many ink cartridges are there in all?

5 + 4 = 9

48 x 9 + 432 cartridges

100

48 x 29

1,392

200

An arrangement of objects in rows and columns

An Array

200

99 x 9

891

200

208 x 5

1,040

200

A bookstore orders 325 copies of a book at $7 each.  How much does the store pay for the books?

325 x $7 = $2,275

200

58 x 86

4,988

300

Unit area equal to the area of a square with one-unit sides

square units

300

25 x 4

100

300

641 x 7

4,487

300

During the summer, Jim makes $115 each week mowing lawns.  How much will joe make in 10 weeks?

$115 x 10 = $1,150

300

49 x 12

588

400

The name of the answer when multiplying

The product

400

37 x 8

296

400

325 x 3

975

400

The marching band rents a van for $208 a day.  They are going away for one week.  How much will it cost to rent the van?

$208 x 7 = $1,456

400

92 x 84

7,728

500

The number close to an exact amount

An estimate
500

42 x 7

294

500

850 x 4

3,400

500

The library subscribes to 67 magazines.  Each month the library receives 3 copies of each magazine.  How many magazines does the library receive in one year?

67 x 3 = 201

201 x 12 = 2,412 copies of magazines in one year

500

56 x 86

4,816