﻿ Free 1s, 10s, 100s, 1,000s Year 4 Addition and Subtraction Learning Video Clip | Classroom Secrets
Maths Resources & WorksheetsYear 4 Maths LessonsAutumn Block 2 (Addition and Subtraction)01 1s, 10s, 100s, 1,000s › Free 1s, 10s, 100s, 1,000s Year 4 Addition and Subtraction Learning Video Clip

# Free 1s, 10s, 100s, 1,000s Year 4 Addition and Subtraction Learning Video Clip

## Step 1: Free 1s, 10s, 100s, 1,000s Year 4 Addition and Subtraction Learning Video Clip

Sebastian the explorer has been researching plants and animals in the jungle. He needs to use his knowledge of 1s, 10s, 100s and 1,000s to collect data about the different species he finds there.

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Discussion points for teachers

1. What could his new total be?
Discuss which operation is necessary. Discuss which values will not change. Discuss the highest and lowest possible combinations. This question is open-ended for the children to explore.
Various answers, for example: 2,739 + 1,400 = 4,139

2. How many insects has Sebastian catalogued altogether?
Discuss how to read a place value grid using the spots on the ladybirds as representations of digits. Discuss adding new amounts, which value will change. Discuss what happens when it crosses a boundary.
6,340 insects

3. Which measurements show the total growth?
Discuss adding two amounts to reach a set value and whether they can be added in any order.
1,000cm + 800cm

4. What is its new height?
Discuss subtracting an amount and which column will change.
5,692cm

5. How many of each type of leaf is Sebastian taking with him?
Discuss subtracting an amount and which column will change. Discuss what happens when it crosses a boundary.
3,016 – 300 = 2,716; 2,497 – 70 = 2,427; 2,332 – 80 = 2,252

National Curriculum Objectives

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