Solve 0.003 × 0.02.

Correct answer: 0.00006. 3 × 2 = 6, and 0.003 and 0.02 have 3 + 2 = 5 decimal places, so the product is 0.00006.

Background: Multiply the digits as whole numbers, then count the total decimal places.

• 0.006: 0.006 has only three decimal places.
• 0.00032: 0.00032 does not come from 3 × 2.
• 0.0006: 0.0006 has only four decimal places.

Did you know? 0.003 has 3 decimal places and 0.02 has 2.

Memory trick: 3 + 2 = 5 decimal places.