2
Two parts of ten
Joyful Mathematics: Chapter 4
GoalSplit 10 into two parts and find the part that makes 10.
New words
number pair · two numbers that make a totalhalf of ten · 5; two fives make 10make 10 · join to get 10
Explanation
Look at both hands. Ten fingers make 10. Fold some fingers down. The fingers up and the fingers down are two parts of 10. 1 and 9 make 10. 2 and 8 make 10. 3 and 7 make 10. 4 and 6 make 10. 5 and 5 make 10.
Worked examples
1 and 9 make 10. The frame is full.
3 and 7 make 10.
5 and 5 make 10. One hand and the other hand.
Class activity
Hide and tell. Put 10 buttons in a line. The child closes their eyes. Hide some buttons under a cup. The child opens their eyes, counts the buttons still showing and says how many are under the cup. Lift the cup to check. Then swap.
Practice
1
7 dots are in the frame. How many more make 10?
3.
2
4 dots are in the frame. How many more make 10?
6.
3
8 and how many make 10?
2.
4
Diya has 6 bangles. She wants 10 bangles. How many more does she need?
4.
5
5 and how many make 10?
5.