Times 2 is doubling. Times 10 puts a 0 on the end. Times 5 counts by fives: 5, 10, 15, 20…
Worked example
5 × 2 = ?
Answer:10
5 × 2 means 2 groups of 5. Count by 5s: 5, 10. So 5 × 2 = 10.
For grown-ups: Multiply/divide within 100 fluently; know all one-digit products from memory. Below: three problems to try with the worked answers, and a free printable sheet. Children can practise the same skill as a game, with no sign-up and no ads.
CCSS 3.OA.C.7
What this practises, for teachers
Practices multiply/divide within 100 fluently; know all one-digit products from memory (3.OA.C.7). A printable sheet with its answer key, worked answers on the page, no accounts.