This math lesson teaches year 1 students about identifying one more and one less than numbers up to 50. The lesson includes interactive space-themed games and activities to practice finding one more and one less of given numbers. Students work on filling in missing numbers on a spaceship, playing a space race game with dice to move along a board and answer one more/one less questions, and completing other number-based puzzles and exercises up to 50. The goal is for students to master finding one more and one less than numbers up to 50.

1. Maths | Year 1 | Number and Place Value | Identify One More and One Less | Lesson 1 of 1: Galactic Maths
Maths
Number and Place Value

3. Success Criteria
Aim
• I can find one more and one less than numbers up to 50.
• I can find one more and one less than numbers up to 50.
• I can find one less than numbers up to 50.

4. All Aboard
Can you find the correct numbers to fill the spaceship?
13 14 15

5. Space Race
What is one more than 43?
40 41 42 43 45 46 47 48 49 50
We can find one more by counting on one.
44
One more than 43 is 44.

6. Space Race
What is one less than 28?
20 21 22 23 25 26 28 29 30
We can find one less by counting back one.
24
One less than 28 is 27.
27

7. Space Race
How to Play:
• Work in pairs to play the Space Race Game by finding one
more and one less.
• Take turns to roll a
dice.
• Move the correct
number of squares.
• Solve the question on
the square you land
on.
• You can use a number
line to help you.
• Who will be the first
to the finish line?

8. Galactic Maths
Click the aliens to reveal the numbers.
22
One more
One less
21
23

9. Galactic Maths
Click the aliens to reveal the numbers.
34
One more
One less
33
35

10. Galactic Maths
Click the aliens to reveal the numbers.
20
One more
One less
19
21

11. Galactic Maths
Click the aliens to reveal the numbers.
47
One more
One less
46
48

12. Galactic Maths
Click the aliens to reveal the numbers.
17
One more
One less
16
18

13. Galactic Maths Activity

14. Dive in by completing your own activity!
Diving into Mastery

15. Make a Rocket
Can you make rockets by finding one less and one more?
35
22
34 50
36

16. Success Criteria
Aim
• I can find one more and one less than numbers up to 50.
• I can find one more and one less than numbers up to 50.
• I can find one less than numbers up to 50.