This video tutorial covers chapter 11 of primary mathematics, focusing on addition and subtraction within 40. It explains how to use a number chart for basic addition and subtraction, introduces addition and subtraction with regrouping, and demonstrates adding three numbers. The tutorial includes various worksheets and exercises, such as matching numbers and a mind workout, to reinforce learning. The chapter concludes with a review and a puzzle-solving activity.

What is the main focus of Chapter 11 in the Primary Mathematics book?

• Multiplication and Division

• Addition and Subtraction within 40

• Geometry and Shapes

• Fractions and Decimals

How can a number chart help in addition?

• By showing the sequence of numbers

• By providing multiplication tables

• By listing prime numbers

• By displaying geometric shapes

If you add 1 to 23 using a number chart, what is the result?

• 25

• 24

• 22

• 26

What is the sum of 24 and 3 using a number chart?

• 26

• 29

• 27

• 28

How do you separate the number 30 into tens and ones?

• 4 tens and 0 ones

• 1 ten and 20 ones

• 2 tens and 10 ones

• 3 tens and 0 ones

What is the result of adding 4 and 1?

• 5

• 6

• 3

• 4

What is the sum of 5 plus 1?

• 7

• 5

• 6

• 4

What is the result of 4 plus 4?

• 7

• 9

• 8

• 6

What does regrouping in addition involve?

• Carrying over numbers to the next column

• Subtracting numbers without borrowing

• Multiplying numbers directly

• Adding numbers without carrying

What is the result of 9 plus 8 with regrouping?

• 17

• 18

• 16

• 15