Bonds of 6, 7, 8, 9: Building
Develop the concept of related addition and subtraction equations, rearranged using the part-part-whole relationship, for two-part bonds of 6, 7, 8 and 9.
Click this link to read Teacher Notes for more information about “Building Equations Using Part-Part-Whole”.
- part-part-whole: where the two parts are a bond of the whole number.
- equals, is equal to
- addition, add, plus
- subtraction, subtract, take away
A little easier
The teacher models Activity 38 Equation Building for Bonds of 6, linking the Bond Blocks, part-part-whole diagram and written equations. This is demonstrated for Bonds of 6 in the video at the top of this page. Leave the worked example on the activity board out for the student to use. The student uses this to complete the same activity for two-part Bonds of 7.
Repeat this. The teacher models Activity 38 Equation Building for Bonds of 8. This is demonstrated in the video below. The student uses this worked example to complete the same activity for two-part bonds Bonds of 9.
A little harder
Addition and subtraction equations don’t have to be written as
Part + Part = Whole
Whole – Part = Part
An alternative arrangement is
Whole = Part + Part
Part = Whole – Part
Apply the concept of building related addition and subtraction equations, using part-part-whole, to find missing parts and missing wholes in addition and subtraction equations. Go to
Bonds of 6, 7, 8, 9: Missing Number Equations, Tic-Tac-Toe