Times Tables · Lesson 8 of 12
8 Times Table
Multiplying by eight is doubling three times. The last digits fall 8, 6, 4, 2, 0, and each fact is ten times the number minus two times it.
- Primary
- Updated
What you will learn
- Say and write the answers in the times table up to .
- Use the patterns in the table to check your answers.
- Use the table to solve simple word problems.
Before you start: you should know multiplication as equal groups. See Multiplication: Equal Groups and Arrays.
The idea
The times table lists multiplied by and so on up to . Each answer is the number of objects in that many groups of .
The whole table
Patterns
- Double three times: is double , then , then .
- Ten times minus two times: is .
- The answers are .
- The last digits count down in twos: and then repeat.
Skip counting
Counting in steps of gives the answers one after another.
An array
An array shows the same facts as rows and columns.
Worked examples
Example 1: Triple double
What is ?
- Double is , double is , double is .
Answer: .
Example 2: Ten minus two
What is ?
- .
- .
- .
Answer: .
Example 3: Spiders
How many legs do spiders have?
- A spider has legs.
- : use plus .
Answer: legs.
Eight is two more away from ten. For any number times , work out ten times it and take away two times it.
Why it matters
Eights show up in octagons, in the 8 bits in a byte, and in the number of legs on an octopus. The doubling and subtraction tricks work for other tables too.
Practice
Your turn. Type or choose an answer, then press Check. Getting one wrong is fine, that is what practice is for. You can try as many times as you like.