Addition using number bonds

Videos, worksheets, games and acivities 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.

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.

Make 10 strategy for Addition
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.



 

 

Adding by grouping tens

 

 

Adding 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

 

 

 

Custom Search

 

We welcome your feedback, comments and questions about this site - please submit your feedback via our Feedback page.

 

© Copyright 2005, 2012 - onlinemathlearning.com
Embedded content, if any, are copyrights of their respective owners.


Useful Links:
More Geometry Help on MathWorld

 

 

   

 

Custom Search