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Arithmetic and Pre-Algebra: Addition and Subtraction
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Why borrowing works

Why borrowing works

An explanation of why (not how) borrowing/regrouping works when subtracting numbers

S

Salman Khan

← Previous Lesson Subtraction 3 Next Lesson → Addition 4

All Lessons in Arithmetic and Pre-Algebra: Addition and Subtraction

1 Basic Addition

3 Basic Subtraction

4 Subtraction 2

5 Level 2 Addition

7 Subtraction 3

8 Why borrowing works

10 Level 4 Subtraction

11 Subtraction Word Problem

12 Alternate mental subtraction method

13 Negative Numbers Introduction

14 Adding Negative Numbers

15 Adding integers with different signs

16 Adding/Subtracting negative numbers

Jump to Lesson

1 Basic Addition
2 Addition 2
3 Basic Subtraction
4 Subtraction 2
5 Level 2 Addition
6 Addition 3
7 Subtraction 3
8 Why borrowing works
9 Addition 4
10 Level 4 Subtraction
11 Subtraction Word Problem
12 Alternate mental subtraction method
13 Negative Numbers Introduction
14 Adding Negative Numbers
15 Adding integers with different signs
16 Adding/Subtracting negative numbers

16 lessons in this course

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