Abacards® Multiply by 8 Patterns

Click your <space Bar> or arrow keys to move the card ahead!

For your IPAD swipe the screen.

Using Your Abacards®

Click and follow along using your abacus.After each click say what you saw.

Practice saying what you will see before you click!After using the Abacards®, make up problems.

Forward Backward

Rule: 8 x (a number) = 10 x (a number) – 2 x (a number)

Abacards® Multiply by 8 Patterns

8x1=10-2=8

8x1=10x1 -2 =8

Abacards® Multiply by 8 Patterns

8x2=20-4=16

8x2=10x2 -4 =16

Abacards® Multiply by 8 Patterns8x3= 10x3 -6 =24

8x3=30-6=24

Abacards® Multiply by 8 Patterns

8x4=40-8=32

8x4= 10x4 -8 =32

Abacards® Multiply by 8 Patterns

8x5=50-10=40

8x5= 10x5 -10 =40

Abacards® Multiply by 8 Patterns

8x6=60-12=48

8x6= 10x6 -12 =48

Abacards® Multiply by 8 Patterns

8x6=60-12=48

8x6= 10x6 -12 =48

Abacards® Multiply by 8 Patterns

8x7=70-14=56

8x7= 10x7 -14 =56

Abacards® Multiply by 8 Patterns

8x8=80-16=64

8x8= 10x8 -16 =64

Abacards® Multiply by 8 Patterns

8x9=90-18=72

8x9= 10x9 -18 =72

Abacards® Multiply by 8 Patterns

10x8=80

10x8=80

Friendly!

Abacards® Multiply by 8 Patterns

8x10= easy =80

Let’s look at the results of Abacus play with 8s Do you see a pattern when you multiply by 8?

To multiply 8 by a number you just multiply 10 by the number and subtract 2x the number!

8x9=10x9-18=90-18=728x8=10x8-16=80-16=648x7=10x7-14=70-14=56 8x6=10x6-12=60-12=488x5=10x5-10=50-10=408x4=10x4- 8=40-8=328x3=10x3- 6=30-6=248x2=10x2- 4=20-4=16 8x1=10x1- 2=10-2=8

Click To Start Again

Friendly Add/Subtract

√√√√√

60-10-270-10-480-20+490-20+2

√

Mental math is easier if you use friendly addition/subtraction!