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Math · Grade 1 Math

Chapter 2: Adding Within 10

Facts to Ten

Put every strategy together and spot the patterns.

Lesson
9
Time
About 13 minutes
0 of 9 done

Step 1: Let's Learn

Read it, or press Listen and follow the words.

You know lots of ways to add now. Count on, swap, or use a double.

A chart of every fact

Every sum lives somewhere on this chart. Tap one and watch what lights up.

All the sums that make the same total sit in a stripe.

Patterns mean less to memorise

The facts to ten are not twenty separate things. Swaps, doubles and ten-partners cut the list to a handful you actually have to learn.

What fluent really means

Not fast guessing. It means the answer arrives without effort, and you could still explain where it came from if asked.

Step 2: Try It Yourself

Tap a square and look for the stripe.

Tap a square. Every other square with the same total lights up too.
Addition chart. Rows are the first number, columns are the second, and each cell is their total.
+012345
0
1
2
3
4
5

Tap any square to see its number sentence.

Step 3: Watch an Example

One step at a time.

Watch Ana Find a Stripe

Ana taps the square where 2 and 4 meet.

  1. Step 1

    The square shows 6.

Step 4: Your Turn

Practice makes it stick.

The Party

Problem 1 of 2

There are 6 girls and 3 boys at a party. How many children in all?

The Fish Tank

Problem 2 of 2

A tank has 4 orange fish and 4 blue fish. How many fish in all?

Mixed Facts

Use whichever strategy suits each one.

1 of 4

2 + 7 = ?

2 of 4

3 + 3 = ?

3 of 4

5 + ? = 10

4 of 4

4 + 5 = ?

Step 5: Quick Check

Show what you know.

Question 1 of 3

7 + 3 = ?

Question 2 of 3

2 + 2 = ?

Question 3 of 3

6 + ? = 9

What You Learned

  • You can add in more than one way.
  • Sums with the same total make a stripe on the chart.
  • Pick whichever way is quickest for you.