Lesson 3 of 8 · Grade 1 and 2
Tens and ones to 50
In a two-digit number, the first digit says how many tens. Read it first.
Step 1
Learn it
-
Tens first
In 37, the 3 means 3 tens. That is 30.
-
Then ones
The 7 means 7 ones. 30 and 7 make 37.
-
Zero ones
In 40 there are 4 tens and 0 ones. No cubes.
Step 2
Watch how
Two examples, worked out one step at a time.
-
How many are shown?
4 tens is 40. 2 ones is 2. 40 + 2 = 42.
Answer: 42 -
Build 28. How many tens and how many ones?
The 2 is tens: 20. The 8 is ones. 20 + 8 = 28.
Answer: 2 tens 8 ones
Step 3
Play with it
Add ones. Snap ten ones into one ten.
Step 4
Practice
Five questions. Think first. Then tap Show answer.
-
3 tens and 5 ones is what number?
Show answer
35
-
2 tens and 9 ones is what number?
Show answer
29
-
How many tens are in 38?
Show answer
3
-
How many ones are in 41?
Show answer
1
-
30 + 6 = ?
Show answer
36