Chapter1.2 Four Operations of Whole numbers.pptx

How to perform addition, subtraction, multiplication and division of whole numbers.

1. Day4 ： 0120-Thursday 1.2 Four Operations of Whole Numbers

2. 1.2 Four Operations of Whole Numbers symbol + - × ÷ Name Addition Subtraction Multiplication Division Result Sum Different Product Quotient

3. 1.2 Addition of Whole Numbers Eg 1. Find the sum of 652 and 49.

4. 1.2 Addition of Whole Numbers Eg 2. Evaluate 325 + 426 + 52.

5. We know that ： 0 + 0 = ？ 0 + 6 = ？ 6 + 0 = ? Conclusion ： 0 + 0 = ？ 0 + a = ？ a + 0 = ? Addition 加法

6. 1.2 Subtraction of Whole Numbers Eg 3. Find the difference between 3018 and 959.

7. 1.2 Subtraction of Whole Numbers Eg 4. Evaluate the following. a) 364 – 289 b) 9872-4356

8. SUBTRACTION 减法 We know that ： 6 - 0 = ？ 6 - 6 = ？ Conclusion ： a – 0 = ？ a – a = ?

9. Homework

10. 1.2 Multiplication of Whole numbers Multiplication is actually an easy method of addition. Multiplication is the same as repeated addition of the same number. 8 + 8 + 8 + 8 = 32 8 × 4 = 32 Eg 1. Find the product of 225 and 8

11. 1.2 Multiplication of Whole numbers Eg 2. Evaluate a) 46 × 15 b) 318 × 109

12. Multiplication 乘法 We know that ： 5×0 = 0×5= 0×0 = 5×1 = 1×5 = Conclusion ： a×0 = 0×a= 0×0 = a×1 = 1×a =

13. 1.2 Division of Whole numbers Division is a process of equal sharing or equal grouping Eg 3. We can divide 12 marbles into 4 groups of 3. Long Division Short Division 被除数 Divident 除数 Divisor 商 Quotient

14. 1.2 Division of Whole numbers Eg4. Divide 1035 by 24. Eg5. Find the quotient and remainder of 9772 ÷ 28..

15. 1.2 Division of Whole numbers Eg6. Find the quotient and remainder of 1398 ÷ 18..

16. Division 除法 We know that ： 0÷6= 6÷0= 0÷0= Conclusion ： 0÷a= a÷0= 0÷0=

17. Homework