Year 1 Ten More, Ten Less (and One More, One Less) Worksheet — Getting Started — Practice Set 4 — Answers
Answer sheet with worked solutions for the Year 1 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 1 · Mathematics · Place ValueYear 1 Ten More, Ten Less (and One More, One Less) Worksheet — Getting Started — Practice Set 4 — Answers
Use place value: ten more or ten less changes the tens digit.
1.One less than 13 is (answer space).
Answer: 12
- 13 − 1 = 12
2.One more than 15 is (answer space).
Answer: 16
- 15 + 1 = 16
3.One less than 18 is (answer space).
Answer: 17
- 18 − 1 = 17
4.One more than 19 is (answer space).
Answer: 20
- 19 + 1 = 20
5.One more than 11 is (answer space).
Answer: 12
- 11 + 1 = 12
6.One less than 4 is (answer space).
Answer: 3
- 4 − 1 = 3
7.One more than 10 is (answer space).
Answer: 11
- 10 + 1 = 11
8.One less than 6 is (answer space).
Answer: 5
- 6 − 1 = 5
9.One more than 1 is (answer space).
Answer: 2
- 1 + 1 = 2
10.One less than 10 is (answer space).
Answer: 9
- 10 − 1 = 9
11.One less than 1 is (answer space).
Answer: 0
- 1 − 1 = 0
12.One less than 15 is (answer space).
Answer: 14
- 15 − 1 = 14
Marking tips
- Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
- For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
- Celebrate what went well first, then pick one thing to work on next.