You have lots of ways now: count on, count up, use a family, use a partner.
Step 1: Let's Learn
Read it, or press Listen and follow the words.
Look at the numbers first. Then pick the way that suits them.
Choosing the method is the lesson
Count on for near numbers, take away for small subtractions, use a bond when you know one. Matching the method to the numbers is the real skill.
Check by going backwards
Add your answer back to the part. If you land on the whole, it was right.
Step 2: Try It Yourself
Tap and try it out.
8
3
5
- 3 + 5 = 8
- 5 + 3 = 8
- 8 − 3 = 5
- 8 − 5 = 3
All four use the same three numbers: 3, 5, and 8.
Step 3: Watch an Example
One step at a time.
Watch Ana Choose
Ana is asked for 10 − 9 and then 4 + 4.
- Step 1
For 10 − 9 she reasons: nearly all went, so 1 is left.
Step 4: Your Turn
Practice makes it stick.
The Bus
Problem 1 of 2
There are 8 people on a bus. 3 get off. How many are still on?
The Library
Problem 2 of 2
Mia has 4 books and borrows 3 more. How many books now?
Mixed Facts
Some are adding and some are taking away. Read carefully.
1 of 4
9 − 5 = ?
2 of 4
3 + 6 = ?
3 of 4
10 − 3 = ?
4 of 4
5 + 5 = ?
Step 5: Quick Check
Show what you know.
Question 1 of 3
7 − 2 = ?
Question 2 of 3
6 + 4 = ?
Question 3 of 3
8 − 8 = ?
What You Learned
- Adding and taking away go together.
- Read the sentence before you start.
- Pick the way that suits the numbers.