Sometimes things don't share out evenly. What's left is the remainder. 17 ÷ 5 is 3 groups of 5 with 2 left over: 3 R 2.
Worked example
16 ÷ 4 = ? with how many left over?
Answer:4 R 0
How many 4s fit into 16? 4 × 4 = 16. So 4 groups with nothing left over: 4 R 0.
For grown-ups: Divide 4-digit ÷ 1-digit. 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 4.NBT.B.6
What this practises, for teachers
Practices divide 4-digit ÷ 1-digit (4.NBT.B.6). A printable sheet with its answer key, worked answers on the page, no accounts.