Do this one in your head
6 × 23
Step 1 — Split the awkward number
Step 2 — Multiply each easy piece
Step 3 — Add them up
Mode:
Splitting a number and multiplying each piece is the distributive law doing your mental arithmetic: 6 × 23 = 6 × 20 + 6 × 3. Run it backwards — spot the common factor and pull it out front — and you've started factorising, which is the next concept.