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
Adding by Making 10
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.
Make 10 strategy for Addition
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.
This video gives the steps for the 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?
Step 4: Add the rest to 10
Adding by grouping tens
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
Singapore Math (Grade 1A): Add a Two-Digit Number and One-Digit Number
Addition using number bonds
Adding double digit numbers with number bonds.
Adding by number bonds
Using number bonds in addition with regrouping
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