2. Introduc tion Introduc tion LESSSO N LESSSO N QUIZ END Class 1

3. Introduc tion Introduc tion LESSO N LESSO N QUIZ END Addition is a mathematical operation off adding; especially the process of computing with sets of numbers so as to find their sum. It is signified by the plus sign (+). Patterns of Additional : 1 + 1 = 2 Addend Sum

4. Repeated addition of 1 is the same a counting; addition of 0 does not change a number. 1+1=2, 2+1=3…..1+0=1, 2+0=2 The plus sign Addition is written by using the plus sign “+” between the terms; that is, in infix notation. The result is expressed with an equals sign.

5. EXAMPLE: IF YOU ADD 2 AND 3 YOU GET 5. YOU WOULD WRITE IT LIKE THIS: 2 + 3 = 5 ADDITION Here 1 ball is added to 1 ball to make 2 balls: Using Numbers it is: 1 + 1 = 2 And in words it is: "One plus one equals two"

6. Example You should get: Klick the best answer 5 9 7 1 a b c d

7. OH NO… YOU ARE WRONG… BackExplaination

8. GOOD JOB…. Back Explanation

9. Explaination 4 balls are added to 3 ball equals 7 1 2 3 4 5 6 7 8 9 10 4 + 3 = 7 1 2 3 Back

10. Longer Addition

11. You can do addition by writing one number below the other and then add one column at a time, like this: 2 3 + 6 3+6= 9 2+0= 2 23 + 6 = 29

12. And it works for bigger numbers, too: 17 + 8 = 25 1 7 + 8 7+8 = 15 52

13. But sometimes two-digit numbers can get in the way like this: 1 6 + 1 6 122 THIS is how it should be done: 1 6 + 1 6 6+6= 12 1+1+1= 3 2 Explaination

14. Did you see how we split the 12 into 1 Ten and 2 Units? We then sent the 1 Ten to the top of the Tens column, so we will remember to add it when we do the Tens. And there is a nice clear space for the Tens answer below.

15. What about the bigger number? The same method works with numbers in the hundreds, thousands and so on. Like this: 3 8 5 + 7 5 0 1 6 1 4 Quiz

16. 1.1 3 + 5 a 11 b 18 d c 15 31 2.3 4 + 2 7 a 55 bd c 62 40 61 3. 4. d c b a d c b a 6 8 5 9 7 4 1 0 Klick the best answer

17. OH NO… YOU ARE WRONG… Back

18. GOOD JOB…. Back

19. Thank You…… By : Wahyu Kurniawati 292009503 PGSD SI SBI UKSW 2009 Back