Think Addition Facts to Subtract Two Numbers
Introduction:
In this session, we are going to learn the subtraction of numbers using the help of addition facts.
Use addition to help you subtract.
8 – 6 =?
6 + __ = 8
What can I add to 6 to make 8?
6, 7, 8
6 + 2 = 8
The missing part is 2.
Think of addition fact to solve the subtraction equation.
So, 8- 6 = 2
Think Addition to Subtract:
Example 1:
Think of addition to help you subtract. Draw the missing part, then write the missing numbers.
Sol:
You can use addition to help you subtract.
4 + ___ = 5
What can I add to make 4 to make 5?
4, 5
4 + 1 = 5
The missing part is 1.
Think of the addition fact to solve the subtraction equation.
5 – 4 = 1
Example 2:
David has 8 crayons in a box. There are 5 crayons still in the box. How many crayons does he take out?
Sol:
David has crayons in a box = 8
Number of crayons still in the box = 5
How many crayons does he take out?
8 – ____ = 5
What additional facts can we use to solve this problem?
____ + ____ = _____
What can I add to 5 to make 8?
5, 6,7, 8
5 + 3 = 8
Think of the addition fact to solve the subtraction equation.
8 – 3 = 5
3 crayons he takes out.
Exercise
- Think of addition to help you subtract. Draw the missing part. Then write the missing numbers.
2. How can an addition fact help you to solve 5 – 4?
3. Which addition facts can help you solve 7 – 2?
Choose two that apply.
- 5 + 2 = 7
- 2 + 5 = 7
- 3 + 4 = 7
4. Write the missing numbers.
5. Draw the missing part.
6. Draw the missing part. Then write the missing numbers.
7. Write the missing numbers.
8. Vicky needs 6 tickets for a ride. He has 3 tickets. How many tickets do Vicky still need?
9. A part is missing in the equations and model. Find the missing part.
10. Draw the missing part
Concept Map:
What We Have Learned
- Use addition facts to solve subtraction problems
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