Eight socks were on the washing line. The wind blew some behind the sheet. Five are still pegged. How many are hiding? How do you know?
A bond is two parts that join to make a number. Here are bonds for 8, then for 9. Keep your eye on the whole: it stays still. Notice what changes in one part when the other part is bigger.
Today we make bonds of 8 and 9. The pupil at the board builds the bond. Everyone else says the two parts aloud before we check the whole.
- 8 as 5 and 3
- 8 as 6 and 2
- 9 as 5 and 4
- 9 as 8 and 1
Build bonds of 8 and 9
In your maths copy, write these carefully, one under the other:
- 5 + 3 = 8
- One bond of 8 or 9 you choose yourself (write the full number sentence)
Find the missing part. The whole and one part are on the bond diagram. What is the other part?
Find the hiding part
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