Lattice method
Helps keep carrying tidy: every digit product gets its own box, and you only add at the end.
Step 1Write 10 across the top and 7 down the right side, one digit per box.
Step 2Multiply each pair of digits. Put the tens above the diagonal and the ones below it.
- 7 × 1 = 7 → tens 0, ones 7
- 7 × 0 = 0 → tens 0, ones 0
Step 3Add along each diagonal, starting at the bottom right. Carry when a sum is 10 or more.
- Diagonal 1 (from the bottom right): 0 = 0
- Diagonal 2 (from the bottom right): 7 = 7
- Diagonal 3 (from the bottom right): 0 = 0
Step 4Read the digits down the left side and along the bottom: 7 0. So 10 × 7 = 70.