Using bar models for addition and subtraction problems

Maths

Measures

Can be a representation of a word problem that helps to identify the calculation needed to solve it.

Help show the relationship between the known and unknown values in a problem.

Help to identify if there is a comparison between two or more values or if there are part-whole relationships or scaling relationships between values.

Known values: 89g and 35g. Unknown: The known values added together. (89g + 35g)

Known values: 89kg and 35kg. Unknown: The difference between the known values. (89g - 35g)]

Match the word problem to the correct bar model.

Match the word problem to the correct bar model

Mass can be measured in grams and kilograms. Capacity can be measured in millilitres and litres.

Mass can be measured in millilitres and grams. Capacity can be measured in litres and kilograms.

Mass can be measured in millilitres and litres. Capacity can be measured in grams and kilograms.

What can mass and capacity be measured in?

What is the capacity of the container?                        (Each interval = 25ml)

I know the mass weighs 1g. The laptop feels four times as heavy as the weight so I estimate the mass of the laptop is 4000g

I know the mass weighs 1kg. The laptop feels four times as heavy as the weight so I estimate the mass of the laptop is 4000g

I know the mass weighs 1kg. The laptop feels four times as heavy as the weight so I estimate the mass of the laptop is 4000kg

I know the mass weighs 1kg. The laptop feels four times as heavy as the weight so I estimate the mass of the laptop is 400g

I know the capacity of the water bottle is 10L. The wheelie bin looks 6 times larger than the bottle so I estimate the capacity of the wheelie bin is 600L

I know the capacity of the water bottle is 10L. The wheelie bin looks 6 times larger than the bottle so I estimate the capacity of the wheelie bin is 60L

I know the capacity of the water bottle is 10L. The wheelie bin looks 6 times larger than the bottle so I estimate the capacity of the wheelie bin is 60ml

I know the capacity of the water bottle is 10ml. The wheelie bin looks 6 times larger than the bottle so I estimate the capacity of the wheelie bin is 60ml

Estimate the capacity of the wheelie bin.

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Using bar models for addition and subtraction problems

Lesson outcome