Flip it
3 × 7 and 7 × 3 have the same answer. If you know one, you know both.
3 × 7 = 7 × 3
The same 21 dots, turned sideways.
Each problem multiplies two numbers from 1 to 12.
Either number can come first, so 6 × 7 and 7 × 6 are both possible. With every pairing from 1 through 12, there are 144 possible problems. Neither number is ever 0.
1 to 144 Smallest: 1 × 1 = 1
Largest: 12 × 12 = 144
Typical level: Grade 3 and beyondIn the U.S. Common Core, Grade 3 students know from memory all products of two one-digit numbers. This practice also includes 10, 11 and 12. Curriculum timing varies.
3 × 7 and 7 × 3 have the same answer. If you know one, you know both.
3 × 7 = 7 × 3
The same 21 dots, turned sideways.
Break one number into parts you already know.
7 × 8
Split 7 into 5 and 2.
5 × 8 = 40 and 2 × 8 = 16.
When you split a number, keep the other number the same in both parts. 7 × 8 is 5 × 8 plus 2 × 8, not 5 × 8 plus 2.