Grade Five
Strand: Numbers and Operations
Topic: Whole Numbers
Sub-Topic: Multiplication

Example/Activity

N-65(c)
(6 x 4) x 5 = 6 x (4 x __)

N-65(d)
5000 x 7 = ______
Think ... 5 x 7 = 35, so 35 000

N-65(e)
How many baseball gloves do you have if there are 15 boxes with 6 in each box?
Think ... 10 x 6 plus 5 x 6

N-65(f)
How many pages in total if there are 6 sections with 9 pages in each section?
Think ... (6 x 10) - (6 x 1)

N-65(g)
There are 8 boxes with 12 golf balls in each box. How many golf balls?
Think ... (8 x 6) x 2 = 48 x 2 = 96

N-65(h)
There are 6 pots with 7 plants in each. How many plants?
Think ... 3 x 7 = 21, so double 21 = 42

N-65(i)
430 x 4 = ____
Think ... 400 x 4 = 1600, 30 x 4 = 120, 1600 + 120 = 1720

N-65(j)
6 x 35 is the same as 3 x 70
8 x 12 is the same as 4 x 24 or 2 x 48

N-66(d)
If the multiplicand is 8 and the product is 56, what is the multiplier?

N-66(e)
Circle the multiple(s) of 6.
24 3 14 15 26 36

N-68
3 x 8 = __        __ = 3 x 8
3 x __ = 24      24 = 3 x __
__ x 8 = 24      24 = __ x 8

N-69(b)
Game tickets cost $13 each. How much do 10 tickets cost? 20 tickets? 1000 tickets? 2000 tickets?
Tack on trailing zeros.

N-70
How many trees are needed in total if we plant 44 on each of four sides of our playground?

N-70(a)
Multiplying front end digits - Think ... 44 x 4 which is approximately 40 x 4 = 160 (use left-most digits).

N-70(b)
Compensating - Think ... 44 is more than 40, so the answer is more than 160.

N-70(c)
Special numbers - Think ... 50 (special) is more, but close to 44. 50 x 4 = 200.
So the answer is less than 200.

N-70(d)
Rounding - to the nearest ten. Think ... 40 x 4 = 160.

N-71
Solve: (use base ten materials if necessary)
If there are six bottles in each case, how many bottles in 243 cases?

Multiply left to right:

N-72
Solve:
2 x 4 x 5 = __

N-73(a)
Give all the multiples of 7 that are less than 40.

N-73(b)
What are all the factors of 8?

N-74
How far can you ride your bike in one minute? At a similar rate, how far could you ride your bike in one hour? One week? One month? One year?
What factors must be considered in order to obtain a reasonable solution?
Decide which method(s) of calculation are most appropriate.