Lesson: Using bar models to represent addition and subtraction word problems

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Lesson details

Key learning points

In this lesson, we will use our knowledge of bar models to interpret if a word problem requires addition or subtraction.

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Starter quiz

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4 Questions

Q1.

3kg and 360g + 5kg and 575g

8 and 935

Correct answer: 8kg and 935g

8kg and 935kg

943 kg g

Q2.

6L and 576ml - 3L and 145ml

3 and 431

Correct answer: 3L and 431ml

3ml and 431L

9L and 721ml

Q3.

Match the word problem to the bar model.

Option 1

Correct answer: Option 2

Option 3

Q4.

Match the bar model to the word problem.

Addy and Melvin collected wastewater, measuring them each month. In April they collected 1 litre and 500 ml and in May they collected another 7 litre and 500 ml. What was the weight of the cans they collected altogether?

Buttons and Addy compared how much water they drank in a day. Addy drank 7 litres and 500 ml. Buttons drank 1 litre and 500 ml less. How much water did Buttons drink?

Correct answer: Mr Slade treated his class to some juice for playing nicely in the hot weather. He used 1 litre and 500 ml of squash. With the right amount of water, it made 7 litres and 500 ml of juice. How much water was in the juice?

Exit quiz

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8 Questions

Q1.

3kg and 600g + 2kg and 400g

1005 kg g

5kg and 1000g

5kg and 1kg

Correct answer: 6kg

Q2.

3kg and 600g + 2kg and 400g

1005 kg g

5kg and 1000g

5kg and 1kg

Correct answer: 6kg

Q3.

Fill in the blanks

We know Ant had 78 marbles and then had 128 marbles. We don't know how many marbles Addy gave him. The relationship between the known and unknown values are that you have to add both known values together to get the unknown value (125 + 78)

Correct answer: We know Ant had 78 marbles and then had 128 marbles. We don't know how many marbles Addy gave him. The relationship between the known and unknown values are that you have to compare the difference between them (125-78)

We know Ant had 78 marbles and then had 128 marbles. We don't know how many marbles Addy gave him. The relationship between the known and unknown values are that you have to compare the difference between them (78-125)

Q4.

Fill in the blanks

We know Ant had 78 marbles and then had 128 marbles. We don't know how many marbles Addy gave him. The relationship between the known and unknown values are that you have to add both known values together to get the unknown value (125 + 78)

Correct answer: We know Ant had 78 marbles and then had 128 marbles. We don't know how many marbles Addy gave him. The relationship between the known and unknown values are that you have to compare the difference between them (125-78)

We know Ant had 78 marbles and then had 128 marbles. We don't know how many marbles Addy gave him. The relationship between the known and unknown values are that you have to compare the difference between them (78-125)

Q5.

Match the word problem with the correct bar model