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Addition and Subtraction
Objectives
To choose a method to find the difference between a pair of numbers.
Resources
Abacus Workbook 3 | Toy Frog, Spider, Fly | 📄 Count up or count back | 📄 1-100 landmarked lines | 📄 0-9 number cards | 📄 100 square
Vocabulary
subtraction | take away | count back
Today's Lesson
Introduction
Before you start the lesson, watch this Recap Video with your student.
Remind your student of the two strategies for working out subtractions that you explored in Lesson Three.
Using 📄 0-9 number cards as you did in Lesson 2, ask your student to decide which strategy to use to find the difference between the smaller number and the larger number.
Discuss. Model finding the answer using Maths Frog to count up to find the difference and using counting back.
Ask:
- Which do you think was more efficient in this example?
Repeat with new numbers.
Ask your student to share their methods for finding the difference and to explain why they used the method they chose.
Main Activity
Ask your student to complete the 📄 Count up or count back subtractions, using the 📄 100 square, Spider and Fly for support if needed.
They should also be able to access 📄 1-100 landmarked lines for support as needed, if they wish.
Workbook
To help your student consolidate their learning from today, please ask them to complete the activities on page 40 of Abacus Workbook 3.