Add and Subtract 100s Year 3 Addition and Subtraction Learning Video Clip

Step 8: Add and Subtract 100s Year 3 Addition and Subtraction Learning Video Clip

Ali and Mick are almost finished getting the Conservation Park back to normal. Help them finish all their jobs so that the park is as good as new.

More resources for Autumn Block 2 Step 8.

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Discussion points for teachers

1. How many metres does the fence need to be moved so that both animals have the same amount of room?
Discuss which method would be best to work out the answer. Does a ‘trial and error’ method work better than a calculation?
350 – 100 = 200 and 150 + 100 = 250. The fence needs to be moved by 100m.

2. How many nuts and bolts are on the fence in total?
Discuss whether all the information given is relevant for the answer.
744 + 100 + 100 = 944

3. Do they have enough money saved to fix all the fences?
Discuss which method has been used to work out the answer.
579 + 100 – 400 + 300 – 100 + 200 – 400 = 279 (yes, they have enough money)

4. How many tickets were sold?
Discuss how to work out the answer and if there are quicker ways to work it out.
474 + 400 + 100 = 974; 974 – 200 = 774

5. Is she correct?
Discuss the different methods of transport that have been used to get to and from the park. Will this affect the total number of visitors to the park? This questions is open-ended for the children to explore.

National Curriculum Objectives

Mathematics Year 3: (3C1) Add and subtract numbers mentally, including a three-digit number and hundreds

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