Fast mental maths, taught properly

Timed drills are not about panic. They train split-and-combine tricks until the arithmetic feels automatic.

Method, step by step

1. 1

   Split 17 into friendly parts: 10 and 7.

2. 2

   Multiply each part: 10 × 6 = 60 and 7 × 6 = 42.

3. 3

   Add them back together: 60 + 42 = 102.

4. 4

   Sanity check: 17 is a bit under 20, and 20 × 6 = 120, so an answer just over 100 is sensible. ✓

Try these next

• 23 × 4
• 19 × 7
• 48 × 5 (halve 5 × 96?)