MathsYear 3Autumn Block 2 (Addition and Subtraction)02 3-Digit Numbers and Ones › Add and Subtract 3-Digit Numbers and Ones Year 3 Addition and Subtraction Learning Video Clip

Add and Subtract 3-Digit Numbers and Ones Year 3 Addition and Subtraction Learning Video Clip

Add and Subtract 3-Digit Numbers and Ones Year 3 Addition and Subtraction Learning Video Clip

Step 2: Add and Subtract 3-Digit Numbers and Ones Year 3 Addition and Subtraction Learning Video Clip

Ali the animal keeper is looking after the animals at the animal park. She is concerned about some of the animals, so she calls Victor the vet. They need your help to complete the calculations.

More resources for Autumn Block 2 Step 2.

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Discussion points for teachers

1. How much does Zeb weigh now?
Discuss how to work step by step to calculate each part of the weight changes. How can you record this? Discuss the results of your calculating and what the information shows about the zebra. Has the zebra lost weight? Were they right to be concerned about Zeb?
376 – 4 = 372; 372 + 7 = 379; 379 – 3 = 376.
Zeb weighs 376 kg.
He hasn’t lost any weight.

2. How much weight could Zee have lost and what could he weigh now?
Discuss working systematically, trying each digit 1-9 in order. Discuss why there are some digits which cannot go in the boxes. This question is open-ended for children to explore.
Various answers, for example: 347 – 6 = 341 kg

3. How much has each giraffe calf grown?
Discuss why you don’t need to look at the hundreds or tens. Discuss how you could record your data, then analyse what your data shows about the giraffes. Discuss how one giraffe appears to be lighter than all the others and has also grown less.
Giraffe 1 has grown 7cm (262 + 7 = 269); giraffe 2 has grown 2 cm (235 + 2 = 237); giraffe 3 has grown 7 cm (281 + 7 = 288).

4. How many caterpillars are left to hatch?
Discuss the metamorphosis of caterpillars into butterflies. Discuss which calculation is needed and why.
129 – 8 = 121.
121 caterpillars still to hatch.

5. Fill in the missing numbers.
Discuss which calculation and method is appropriate for each missing number.
917; 6; 261 are the missing numbers

National Curriculum Objectives

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

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