How can you use your fingers to find the number pairs to ten?
You have ten fingers. If you close both your thumbs (2 fingers), you have 8 fingers left stretched out. This is 2 closed and 8 stretched out, which is 10 combined, so now you know that 2 and 8 are number pairs. If you close one hand, then 5 fingers are closed and 5 fingers are stretched out. Adding this together makes 10, so now you know that 5 and 5 are number pairs. In addition to having number pairs to ten, you also have number pairs to five. Use one hand only and see if you can fins the number pairs to five.
And it’s not just five and ten. You can have number pairs to many other numbers.