8 × 9 = 72
8 multiplied by 9 equals 72
This shows 8 columns × 9 rows = 72 circles in total
Each row has 8 circles, and there are 9 rows
8 × 9 = 8 + 8 + 8 + 8 + 8 + 8 + 8 + 8 + 8 = 72
Adding row 1 of 9...
Additional information how to quickly calculate this multiplication:
- Hand method:
For numbers between 5 and 10, you can use this special method (this looks easier when visualized using palms, I will explain it later):
8 × 9 = ((8-5) + (9-5)) × 10 + (10-8) × (10-9)
= ((3 + 4) × 10) + (2 × 1)
= (7 × 10) + 2
= 72 - Plus method:
If you know 8 × 8 = 64, then 8 × 9 = 64 + 8 = 72 - Minus method:
If you know 8 × 10 = 80, then 8 × 9 = 80 - 8 = 72