Multiply by 9
key notes :
The 9 times Table
- 9 × 1 = 9
- 9 × 2 = 18
- 9 × 3 = 27
- 9 × 4 = 36
- 9 × 5 = 45
- 9 × 6 = 54
- 9 × 7 = 63
- 9 × 8 = 72
- 9 × 9 = 81
- 9 × 10 = 90
- 9 × 11 = 99
- 9 × 12 = 108
💡 When we multiply a number by 9, we add the number to itself 9 times.
2 × 9 =?
2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 = 18
💡 Tip:
- 2 x 9 is the same as 9 x 2.
- 3 x 9 is the same as 9 x 3.
- 4 x 9 is the same as 9 x 4.
💡 A Smart Trick:
Think about multiplying by 9 like multiplying by 10 and then taking away one of the factor.
3 x 9 = (3 x 10) – 3 = 27 ✅
Learn with an example
Multiply.
2 x 9 =?
This array shows that 2 × 9 = 18. It has 2 rows with 9 dots in each row.
There are 18 dots in all.
2 x 9 = 18
Multiply.
7 x 9 =?
This number line also shows that 9 × 7 = 63. Count by 7s on the number line. Count forward 9 times.
The last arrow ends at 63.
9 × 7 = 63
Multiply.
9 × 0 =
The zero property of multiplication says that the product of any number and 0 is 0. This means that 0 times any number is 0.
So, the product of 9 and 0 is 0.
9 × 0 = 0
let’s practice!
