 Related Topics:
Lesson on Number Bonds
More Lessons for Singapore Math

Videos, worksheets, solutions and activities to help students learn addition using number bonds in Singapore Math.

In this lesson, we will learn

• Adding by Making 10 using Number Bonds
• Adding Tens and Ones using Number Bonds
The following figure shows how to use Number Bonds and Make Ten Strategy for Addition. Scroll down the page for more examples and solutions. The "Make 10" strategy is used in Singapore Math for addition within 20. Using the idea of number bonds, the students have already been trained to recognize patterns of numbers that make 10.
1 and 9 makes 10
2 and 8 makes 10
3 and 7 makes 10
4 and 6 makes 10
5 and 5 makes 10

This pattern is then used to add other numbers.

For example,
8 + 6 is rewritten as 8 + 2 + 4 = 10 + 4 = 14

With sufficient practice, the students should be able to do the math in their heads.

The following video shows how to add within 20 using the "make 10" strategy.
Examples:
7 + 5
4 + 9
8 + 7 Make 10 strategy when adding within 20
Step 1: The first addend and what make 10
Step 2: Write the number below the second addend
Step 3: The number below the second addend and what make the second addend?
Examples:
1. Gus has 9 cherries. Ava gives him 4 more. How many does Gus have altogether?

2. Gus has 9 hearts. Ava gives him 6 more. How many does Gus have altogether?

3. Gus has 7 stars. Ava gives him 9 more. How many does Gus have altogether?

4. Gus has 5 bouncy balls. Ava gives him 7 more. How many does Gus have altogether?

### How to Add Tens and Ones

When adding 2-digit numbers, the Singapore Math teaches the students to add tens and ones.

For example, 53 + 28 = ?

Step 1: Use Number bond to split. 53 = 50 +3, 28 = 20 + 8
Step 2: Add the tens. 50 + 20 = 70
Step 3: Add the ones. 3 + 8 = 11
Step 4: 70 + 11 = 81
Step 5: 53 + 28 = 81

Examples:
12 + 4
13 + 4
15 + 4
5 + 14
12 + 8
2 + 18

Adding double digit numbers with number bonds
9 + 5
8 + 7
7 + 9
14 + 5
4 + 13
17 + 2
17 + 8 Adding by number bonds
Doubles and Doubles plus 1 Using number bonds in addition with regrouping
How can I use number bonds to add numbers with regrouping?
Examples:
7 + 9
8 + 7
60 + 80
88 + 23

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