You have added tens. You have added ones. Now do both.
Step 1: Let's Learn
Read it, or press Listen and follow the words.
Two steps
13 + 24. Tens first: 1 ten and 2 tens make 3 tens. Then ones: 3 and 4 make 7.
3 tens and 7 ones is 37.
Why split into tens and ones
You already know how to add tens, and how to add ones. Splitting turns one unfamiliar sum into two familiar ones.
Then put them back together
20 + 10 is 30, 3 + 4 is 7, so the answer is 37. The last step is joining the two answers.
Step 2: Try It Yourself
Tap and try it out.
First number
and Second number
Altogether
Tens
3
Ones
7
13 + 24 = 37
1 tens and 2 tens make 3 tens. Ones go with ones.
Step 3: Watch an Example
One step at a time.
Watch Leo Add Both
Leo works out 13 + 24.
- Step 1
He counts the rods: 1 and 2 makes 3 rods.
Step 4: Your Turn
Practice makes it stick.
Two Classes
Problem 1 of 1
12 children in one class and 15 in another. How many?
children
Tens First, Then Ones
1 of 3
11 + 12 = ?
2 of 3
14 + 23 = ?
3 of 3
22 + 16 = ?
Step 5: Quick Check
Show what you know.
Question 1 of 2
21 + 14 = ?
Question 2 of 2
What do you add first?
What You Learned
- Add the tens to the tens.
- Add the ones to the ones.
- Then say the answer as tens and ones.