x + 5 = 12: a tape of 12 is split into x and 5. So x = 12 − 5 = 7. 3x = 12: three equal boxes make 12, so each box is 12 ÷ 3 = 4. Check by putting it back.
Worked example
Solve: x + 10 = 11. What is x?
Answer:x = 1
x plus 10 makes 11. Undo the add: 11 − 10 = 1. Check: 1 + 10 = 11.
For grown-ups: One-step equations and inequalities. 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 6.EE.B.5–8
What this practises, for teachers
Practices one-step equations and inequalities (6.EE.B.5–8). A printable sheet with its answer key, worked answers on the page, no accounts.