1. Introduction to the Bar Model Addition and Subtraction
Miss Bishell-Wells

2. We use bars to help us visualise a problem
We use bars to help us visualise a problem. To begin with we are going to look at some simple examples together.
19 + 7
Try:
Method
Calculation ?
19 + 7
= 26 19 7

3. 19 + ? = 28
Method
Calculation
Try: 28
= 9 19 ?

4. There are 32 children in Year 4 and 33 in Year 5.
How many children are there in Years 4 and 5 ?
Method
Calculation
Try: ?
= 65 32 33
Year 4
Year 5

5. There were 423 people on Train A, 298 people
on Train B and 196 people on Train C.
How many people were there altogether ?
Method
Calculation
Try: ?
423
298
196
= 721
Train A
Train B
Train C
= 917

6. Try: ? There were 341 people on the school trip from
two different schools. There were 276 people
from one school.
How many people were from the other school ?
Method
Calculation
Try:
341
= 65
276 ?

7. Try: There were 56 children in the music lesson, but 5
went to the toilet and 3 were sent home because
they were ill.
How many children were left in the lesson?
Method
Calculation
Try: 56
5 + 3
= 8
56 - 8
= 48 5 3
Toilet
Ill ? 8 5 3

8. Now try these The attendances at three football matches were
45 674, and
What is the total attendance for the three games?
674, 128 and 763.
There were people at the pop concert (in Stands A,B and C).
In Stand A there was and in Stand B there were people. How many people were in Stand C?
There were 2491 people at the pop concert (in Stands A,B and C).
In Stand A there was 432 and in Stand B there were 652 people. How many people were in Stand C?