The method has not changed. Tens with tens, ones with ones.
Step 1: Let's Learn
Read it, or press Listen and follow the words.
Two steps, bigger numbers
42 + 35. Tens: 4 and 3 make 7 tens. Ones: 2 and 5 make 7 ones.
7 tens and 7 ones is 77.
Split, add, rejoin
Add the tens, add the ones, put them back together. Three easy steps instead of one hard one.
Know roughly first
45 + 32 is a bit more than 70. Having a rough answer means a silly one cannot slip past you.
Step 2: Try It Yourself
Tap and try it out.
First number
and Second number
Altogether
Tens
7
Ones
7
42 + 35 = 77
4 tens and 3 tens make 7 tens. Ones go with ones.
Step 3: Watch an Example
One step at a time.
Watch Ana Add to 100
Ana works out 42 + 35.
- Step 1
She counts the rods: 4 and 3 makes 7.
Step 4: Your Turn
Practice makes it stick.
Two Collections
Problem 1 of 1
Leo has 31 cards. Ana has 24. How many altogether?
cards
Tens First, Then Ones
1 of 3
23 + 41 = ?
2 of 3
52 + 36 = ?
3 of 3
45 + 30 = ?
Step 5: Quick Check
Show what you know.
Question 1 of 2
34 + 25 = ?
Question 2 of 2
61 + 27 = ?
What You Learned
- Add the tens, then add the ones.
- The method is the same at any size.
- 42 + 35 = 77.