Properties
Which property of multiplication says 3 × 7 = 7 × 3?
Commutative
Round to the greatest place 36 × 81 to estimate the product.
40 x 80 = 3200
Multiply: 234 × 6
1,404
A teacher gives each of 24 students a set of 8 markers. How many markers does the teacher need in total?
192 markers
Use the associative property to show how to compute (4 × 25) × 2 by regrouping; write the equivalent expression.
(4 x 2) x 25
Estimate 724 × 654 by rounding to the greatest place.
700 x 700 = 490,000
Multiply: 4,205 × 3
12,615
A charity packs 342 snack bags each day for 7 days to donate. How many snack bags do they pack in all?
2,394 snack bags
Which property explains why 1 × 456 = 456?
Identity
Determine whether 198 × 49 is closer to
A. 200 × 50 or B. 200 × 40
B
Multiply: 1,236 × 8
9,888
A factory produces 4,125 toy cars each week. How many toy cars will it produce in 6 weeks?
24,750 toy cars
Use the distributive property to simplify 9 × 47 by breaking 47 into 40 + 7; write the new expression.
9 x (40 + 7)
Use rounding to estimate 3,487 × 94. What is the estimate?
3,000 x 90 = 270,000
Multiply: 3,412 × 20
68,240
A library orders 3,204 copies of a workbook. Each box contains 40 workbooks. How many workbooks are there in 80 boxes?
40 x 80 = 3,200 workbooks
True or false: If a × b = a × c, then b = c.
False: 0 x 5 = 0 x 7 , but 5 does not equal 7.
A store packs 67 items per box. Estimate the number of items in 128 boxes by rounding.
70 x 100 = 7,000 items
Multiply: 4,789 × 30
143,670
A landscaper plants 25 plants in each row. They plan to plant 70 full rows. How many plants will they plant in total?
1,750 plants