addition and subtraction
DESCRIPTION
ADDITION AND SUBTRACTION. Primary 2. Addition. Ali has 3 apples. Yazmin has 2 apples. How many apples do they have altogether?. 3 + 2 = 5. The boys have 5 apples altogether. Look at this example:. Try !. 10. 12. 26. +. =. ?. +. =. 16. 13. 10 + 16 = 26. Addition. - PowerPoint PPT PresentationTRANSCRIPT
AdditionAli has 3 apples. Yazmin has 2 apples.
How many apples do they have altogether?
The boys have 5 apples altogether.
3 + 2 = 5
Addition without renaming
1. Find the sum of 34 and 23.
3 4
+ 2 3
Tenth Unit
First, add the units then add the tenths
75
Addition with renaming
1. Find the sum of 49 and 32
1
4 9
+ 3 2
First, you must add units and then tenth
UnitTenth
18
Addition- problem Solving
There are 16 boys and 14 girls in the classroom. How many children are there in the classroom?
To find the sum, add the two numbers.
16 + 14 = 30
The sum of 16 and 14 is 30.
Therefore, there are 30 children in the classroom.
Boys Girls
16 14
Addition- Problem solving
56 girls took part in the walkathon. If 15 more boys than girls have taken part in the Walkhaton, how many boys
are there?
To find the whole (or bigger quantity), we add;
56 + 15 = 71
Girls
56
15
?
Boys
The sum of 56 and 15 is 71.The sum of 56 and 15 is 71.
Therefore, there are 71 boys took part in the Therefore, there are 71 boys took part in the Walkhaton.Walkhaton.
Subtraction Amin has 10 pencils
whole
6 of them are long
The rest are short.
?
part
To find one part, we subtract.
10 – 6 = 4Amin has 4 short pencils.
SubtractionNor has 5 ducks. She gave 2 of her ducks to her sister.. How
many ducks does she have now?
5 – 2 = 3She has 3 ducks now.
Subtraction without renaming1. Find the difference between
27 and 15.
2 7
- 1 5
1 2
UnitTenth
First you must subtract the units then followed by the tenths
SUBTRACTION- Problem solving68 children take part in the drawing
contest. 37 of them are boys. How many girls are there?
Boys Girls
68
37 ?
The difference between 68 and 37 is 31.The difference between 68 and 37 is 31.
Therefore, there are 31 girls.Therefore, there are 31 girls.
To find one part,To find one part,
we subtract we subtract 68 – 37=3168 – 37=31
SUBTRACTION – Problem Solving154 boys in a school took part in the cross country race . If there are 51 less girls than boys. How many girls have taken part in the
cross-country race?
The difference between 154 The difference between 154 and 51 is 103.and 51 is 103.
Therefore, there are Therefore, there are 103103 girls. girls.
To find one part, To find one part, we subtract we subtract 154 – 51=103154 – 51=103
Girls less
Boys
? 51
154
1 5 4- 5 1
1 0 3