6.1
Introducing the Eights Multiplication Facts
Look at this array. What do you see?
2×6=
=6×2
2×6=
=6×2
4×6=
=6×4
2×6=
=6×2
4×6=
=6×4
8×6=
=6×8
What strategy can you use to figure out the product?
Look at the next array. What do you see?
What strategy can you use to figure out the product?
I used the double, double strategy.
Look at the next array. What do you see?
How can you use the fours fact to help you
figure out the product for the eights fact?
8 sixes is the same as
double, double, double 6.
Is this an easy strategy to use?
What other eights facts could you solve using this strategy?
Step Up
1. Look at these pictures. Write the products.
a.
b.
c.
double 9
double, double 9
2×9=
128
4×9=
8×9=
ORIGO Stepping Stones 3 • 6.1
© ORIGO Education.
double, double, double 9
2. Write the products for these.
a.
b.
c.
d.
2×3=
2×7=
2×5=
2×8=
4×3=
4×7=
4×5=
4×8=
8×3=
8×7=
8×5=
8×8=
3. Use a doubling strategy to complete this table.
Double
(×2)
Number
Double Double
(×4)
Double Double
Double (×8)
6
7
20
36
Write numbers in the squares so that the numbers in each
row and column multiply to give the product in the circle.
Step Ahead
© ORIGO Education.
a.
8 2
4 5
32
10
ORIGO Stepping Stones 3 • 6.1
b.
c.
16
56
40
20
12
36
28
24
72
20
129
Reinforcing the Eights Multiplication Facts
6.2
Amber bought 8 of these packs of pencils.
How many pencils did she buy in total?
How could you figure it out?
What should you write in each of the boxes
below to show how many pencils she bought?
×2
×2
×2
3
×
8
Double 3 is 6, double 6 is
12, and double 12 is 24.
So 8 packs of 3 is 24.
Jamal bought 8 different packs of pencils.
Each pack had 2 pencils. How many pencils did he buy?
How could you figure it out?
It is easier to think double 8 than double, double, double 2.
What other problems could you solve using these strategies?
1. S
how how you could use the double, double, double strategy to
solve each word problem.
a. Zoe bought 6 packs of stickers.
There are 8 stickers in each pack.
How many stickers did she buy
in total?
b. Ramon bought 8 packs of trading
cards. There are 9 cards in each
pack. How many trading cards
did he buy in total?
double
double
double
double
130
is
double
is
is
double
is
is
is
ORIGO Stepping Stones 3 • 6.2
© ORIGO Education.
Step Up
2. Complete each picture.
a.
×2
×2
b.
×2
×2
5
×2
×2
×2
7
×
c.
×2
×2
×
×2
d.
×2
×2
4
8
×
×
3. Complete each fact. Then write the turnaround fact for each.
a.
b.
8×3=
×
=
c.
8×6=
=
×
8×2=
×
=
4. Think about the fours and eights facts. Write the missing number in each equation.
a. 4 × 7 =
d. 24 =
g.7 ×
×6
= 56
b.16 = 2 ×
c.
e.
f.40 =
× 8 = 64
h. 32 =
© ORIGO Education.
Use repeated doubling to
complete the missing numbers.
×2
× 10
i. 3 × 8 =
×8
Step Ahead
× 4 = 36
×2
×2
×2
4
× 16
ORIGO Stepping Stones 3 • 6.2
131