Numbers up to 50
Primary 1 · Mathematics
Numbers up to 50
Lesson 3 of 6
12 min
Let's begin
Habimana collects bottle caps for a game at break.
He drops every ten caps into a small bag. Three bags are already full.
More loose caps keep coming. Today you will count all the way to 50.
After 30 you keep going: 31, 32, 33, 34, 35.
Then 36, 37, 38, 39, 40.
Read this table out loud. Point at each number as you say it.
| 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 |
| 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 |
Look at the second digit in the top row. It goes 1, 2, 3 up to 9, then 0.
The bottom row does exactly the same thing.
The first digit tells you the bags. The second digit tells you the loose caps.
Worked example
what comes after 39?
39 is 3 bags and 9 loose caps.
Habimana finds one more cap. Now he holds 10 loose caps.
Ten loose caps make a new bag. He packs them away.
Now there are 4 bags and 0 loose caps. That is 40.
Careful! Do not say thirty-ten. There is no such number.
The same thing happens at 49. One more cap makes five full bags: 50.
Worked example
write thirty-two.
Thirty means 3 tens. Write 3.
Two means 2 ones. Write 2 beside it.
You get 32.
Careful! 302 is not thirty-two. 302 is a huge number, far past 50.
Now try forty-six. Forty is 4 tens. Six is 6 ones. You get 46.
Tip
Nine is full. Make a bundle
When the loose ones reach nine, the next number starts a brand new ten.
29 then 30. 39 then 40. 49 then 50. Say those three pairs out loud.
Count all the way to 50.
Say each answer out loud first. Then tap Show answer to check.
What number comes after 34?
Answer: 35. The loose ones go from 4 to 5.
What number comes after 39?
Answer: 40. Nine loose caps and one more make a new bag.
Write the number for forty-six.
Answer: 46. Four tens, then six ones.
What number comes after 49?
Answer: 50. That is five full bags.
Keza reads out 41, 42, 43, ___, 45. Which number did she miss?
Answer: 44. It sits between 43 and 45.
What you learned today
Quick check
What number comes after 39?
