Number bonds
Horizontal number bonds
Find one missing part in two-part equations with a fixed whole from 5 to 100, six equation layouts and up to 30 problems.
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Number bond trees
Split a fixed whole from 5 to 100 into two or three parts, with a single missing child and an option to include or exclude zero.
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Use the whole to find the missing part in each number bond tree.
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Learning objective
What this activity builds
Read a number bond diagram as one whole connected to parts and determine the single missing part.
Worked example
A tree has whole 10 and child parts 6 and __. What is missing?
4
The child circles are parts of 10. Since 6 + 4 = 10, the missing child is 4. The parent circle remains the whole and is never the blank.
Teaching notes
Make the practice count
- Trace each branch from the whole to a part circle before calculating.
- Start with two parts and a whole of 10. Add three-part trees only after the learner can combine two known parts before finding the remainder.
- Allow zero when teaching that a whole can include an empty part. Turn it off when every part circle should represent at least one. A small set may repeat only after every possible arrangement of parts has been used.
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