1
Two parts of five
Joyful Mathematics: Chapter 4
GoalSplit 5 into two parts and find the part that makes 5.
New words
part · one piece of a numberpair · two numbers that go togethermake 5 · join to get 5
Explanation
A hand has 5 fingers. Fold some fingers down. The fingers up and the fingers down are two parts of 5. 1 and 4 make 5. 2 and 3 make 5. 3 and 2 make 5. 4 and 1 make 5. If you know one part, you can find the other part.
Worked examples
1 and 4 make 5. One blue dot and four orange dots fill the top row.
3 and 2 make 5.
Hold 5 pencils. Put 3 in one hand and 2 in the other hand. 3 and 2 make 5.
Class activity
Two plates. Take 5 buttons and two plates. Share the buttons between the plates in as many ways as you can: 5 and 0, 4 and 1, 3 and 2, 2 and 3, 1 and 4. Say each pair aloud. Every pair makes 5.
Practice
1
3 dots are in the frame. How many more make 5?
2.
2
1 dot is in the frame. How many more make 5?
4.
3
5 is 4 and how many?
1.
4
Show 5 as 2 and how many?
3.
5
Write all the pairs that make 5.
1 and 4, 2 and 3, 3 and 2, 4 and 1.