One more, one less, ten more and ten less – Grade 2 math lesson
Lesson 7 of 16 in the Grade 2 math course
US version. US grades, US spelling and dollars ($). · UK Maths Department
A complete 45-minute lesson for grade 2 (ages 7–8) that runs on this page – at school or at home. Every answer is graded right away, with a worked explanation.
- Time
- 45 minutes + 15 min homework
- Grade
- Grade 2 (ages 7–8)
- You need
- Paper, a pencil and this page
- Graded
- Instantly, with explanations
For parents: how to use this lesson
You don't need to know this topic yourself. The lesson explains each step on screen, one tidy step at a time. Every answer is graded straight away with a worked explanation, so you never have to grade anything.
- Read what your child will learn and the big ideas together.
- Press Start the lesson below and sit with your child for the teaching and the worked examples (about 19 minutes).
- Let them do the practice on their own. They choose Getting started, On track or Challenge – start on On track and move up after a few right in a row.
- Finish with the exit ticket and the talk question: “When you find 10 more than 47, which digit changes and why?”
- Later that day or the next day: the homework (15 minutes), then a practice test.
Watch out for
- Changing the ones digit when finding 10 more. Use a hundred square: 10 more is the number straight below.
- Getting stuck when the tens go past 9 (95 + 10). Count on in tens with a number line: 95, 105.
Tip for home: Look at door numbers on a walk: what is 1 more, 10 more, 10 less?
What your child will learn
Learning goal: find 1 more, 1 less, 10 more and 10 less than a number (and 100 or 1,000 more or less).
Success looks like
- I can find 1 more and 1 less.
- I can find 10 more and 10 less.
- I can explain which digit changes.
Key words
- more
- a bigger number
- less
- a smaller number
- digit
- one of the symbols 0 to 9
- tens
- the column worth ten each
What to have ready
- Paper and a pencil
- This page on a computer, tablet or phone
- For the hands-on part: Build a number with tens and ones (bundles of ten straws, or sticks of ten cubes). Add one ten, then take one away, and say the new number each time. No blocks? Draw tens as lines and ones as dots.
The big ideas (for the adult)
One more is the next number when you count up. One less is the number just before it.
Ten more changes the tens digit by one: 34 becomes 44. The ones digit stays the same.
The same idea works for 100 more or 1,000 more: only one digit changes, unless you go past 9 in that column.
The lesson, step by step
| Part | Time | How it is checked |
|---|---|---|
| Starter: quick recall | 5 min | Graded by Classfern |
| Teaching input | 10 min | Not assessed, self-checked |
| Worked examples and guided practice | 9 min | Not assessed, graded by Classfern |
| Independent practice | 15 min | Graded by Classfern |
| Closure and exit ticket | 6 min | Graded by Classfern, self-checked |
Starter, "your turn", practice and exit ticket are graded by Classfern. Worked examples and teaching are not assessed. The hands-on task and the reflection are self-assessed. Explanations in talk are judged by the parent and not recorded.
The lesson
It runs here on the page. No sign-up and no names – progress is kept only in this browser.
Homework and practice at home
15 minutes: 8 practice questions, 3 multiple-choice questions and 2 to remember from earlier work, then a short reflection. New questions every time, all graded instantly.
More practice
More Grade 2 math lessons
- Addition facts to 10 and 20
- Adding and subtracting
- The equals sign and missing numbers
- Addition and subtraction word problems
- Multiplication and division
- Skip counting
- Tens and ones
- Number lines
- Comparing, ordering and writing numbers
- Recognizing fractions
- Counting coins
- Telling time
- Measuring length
- Picture graphs and bar graphs
- Shapes and position
Curriculum
Common Core State Standards 2.NBT.B.8: “Mentally add 10 or 100 to a given number 100-900, and mentally subtract 10 or 100 from a given number 100-900.”
Our lessons and questions are our own. They are not written or endorsed by any government department, testing agency or exam board.