PPT: How Many Times | Mathematics for Class 1: NCERT (Joyful-Mathematics) PDF Download

 Page 1


 How Many Times?
Page 2


 How Many Times?
Multiplication as Repeated Addition
Two elephant families are going for a 
jungle walk. Each family has 4 elephants, 
so there are 8 elephants total. This can be 
expressed as a repeated addition of 4 + 
4.
Adding the same number over and over 
again is called repeated addition.
Edurev Tips: 4 + 4 = 8 is called repeated 
addition because 4 is added repeatedly.
Page 3


 How Many Times?
Multiplication as Repeated Addition
Two elephant families are going for a 
jungle walk. Each family has 4 elephants, 
so there are 8 elephants total. This can be 
expressed as a repeated addition of 4 + 
4.
Adding the same number over and over 
again is called repeated addition.
Edurev Tips: 4 + 4 = 8 is called repeated 
addition because 4 is added repeatedly.
Another Way of Writing Repeated Addition
Instead of adding 5 four 
times, you can use 
multiplication: 4 x 5 = 
20.
4 x 5 = 20 is read as 4 
times 5 is equal to 20. 
Or 4 multiplied by 5 is 
equal to 20.
Tips: 4 x 5 is a shorter 
way to write 5 + 5 + 5 + 
5 = 20.
Page 4


 How Many Times?
Multiplication as Repeated Addition
Two elephant families are going for a 
jungle walk. Each family has 4 elephants, 
so there are 8 elephants total. This can be 
expressed as a repeated addition of 4 + 
4.
Adding the same number over and over 
again is called repeated addition.
Edurev Tips: 4 + 4 = 8 is called repeated 
addition because 4 is added repeatedly.
Another Way of Writing Repeated Addition
Instead of adding 5 four 
times, you can use 
multiplication: 4 x 5 = 
20.
4 x 5 = 20 is read as 4 
times 5 is equal to 20. 
Or 4 multiplied by 5 is 
equal to 20.
Tips: 4 x 5 is a shorter 
way to write 5 + 5 + 5 + 
5 = 20.
Multiplication on a Number Line
Start at 0
Begin at the starting 
point
Make 3 jumps
Each jump covers 5 
units
Reach 15
3 x 5 = 15
3 x 5 = 15 can be shown on a number line as 3 jumps of 5 units each.
Page 5


 How Many Times?
Multiplication as Repeated Addition
Two elephant families are going for a 
jungle walk. Each family has 4 elephants, 
so there are 8 elephants total. This can be 
expressed as a repeated addition of 4 + 
4.
Adding the same number over and over 
again is called repeated addition.
Edurev Tips: 4 + 4 = 8 is called repeated 
addition because 4 is added repeatedly.
Another Way of Writing Repeated Addition
Instead of adding 5 four 
times, you can use 
multiplication: 4 x 5 = 
20.
4 x 5 = 20 is read as 4 
times 5 is equal to 20. 
Or 4 multiplied by 5 is 
equal to 20.
Tips: 4 x 5 is a shorter 
way to write 5 + 5 + 5 + 
5 = 20.
Multiplication on a Number Line
Start at 0
Begin at the starting 
point
Make 3 jumps
Each jump covers 5 
units
Reach 15
3 x 5 = 15
3 x 5 = 15 can be shown on a number line as 3 jumps of 5 units each.
Multiplication Using an Array
Array Arrangement
An array is a grid of 
numbers or objects 
arranged in rows and 
columns.
Children in Rows and 
Columns
Look at the picture of 
15 children sitting in 3 
rows and 5 columns: 
Here, there are 3 equal 
groups of 5 children.
Multiplication Formula
There are 3 x 5 = 15 
children in all.
Number of groups x 
Equal number of 
objects in each group = 
Number of objects