﻿ Add 3-Digit and 1-Digit Numbers Year 3 Addition and Subtraction Learning Video Clip | Classroom Secrets
MathsYear 3Autumn Block 2 (Addition and Subtraction)03 Add 3-Digit and 1-Digit Numbers › Add 3-Digit and 1-Digit Numbers Year 3 Addition and Subtraction Learning Video Clip

# Add 3-Digit and 1-Digit Numbers Year 3 Addition and Subtraction Learning Video Clip

## Step 3: Add 3-Digit and 1-Digit Numbers Year 3 Addition and Subtraction Learning Video Clip

Maintenance Mick is fixing and mending items around the animal park. But things don’t always run smoothly for Maintenance Mick! He needs urgent help with his calculating!

More resources for Autumn Block 2 Step 3.

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Discussion points for teachers

1. How long should the fence have been?
Discuss which methods could be used to solve the calculation: number line, using resources to help such as Base 10 or column addition. Discuss how to clearly record your method.
297 + 8 = 305m

2. What mistake has he made?
Discuss what calculation Mick should have done. Look carefully at the number line and systematically check each part of the calculation is represented accurately on the number line.
Mick has jumped 8cm instead of 7cm. He should have jumped 4cm then a further 3cm, to get to 393cm.

3. What could the missing numbers be?
Look carefully at the digits that are given. What do you notice? Systematically work through the digits which could fill the first missing box. Discuss making a list to help. Why can some digits NOT go in this box? Which digits can fill this box and why? This question is open-ended for children to explore.
The missing digits could be 4 and 0, 5 and 1, 6 and 2, 7 and 3, 8 and 4 or 9 and 5.

4. Help him to correct the mistakes.
Work systematically through the calculation to find the mistakes. How could he have spotted his mistake earlier? Discuss how you can help yourself to NOT make the same mistakes as Mick.
Mick forgot to add the exchanged 10 to the 90. The answer is 904m.

5. Help Maintenance Mick calculate the total lengths.
Discuss how you can record both addition calculations for each animal: you could record each one separately or do both at once using a column addition. Discuss completing both calculations before recording the answer in the chart.
Lions = 751m, Leopards = 612m, Tigers = 801m

Optional discussion points:
What else might Mick have to measure and calculate at the animal park?

National Curriculum Objectives

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

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