Number arithmetic operations
1. Multiplication Operation
Take a look at the following picture!
each group
contains ... fruit.
2 groups
The image above states:
2 × ... = 12 total
each group there are 6 pieces
4 groups
Next, pay attention:
a. Double addition
2 × 6 = 6 + 6 = 12
number 6.
b. Add three times the number 2.
3 × 2 = 2 + 2 + 2 = 6
c. Addition of twice the number 3.
2 × 3 = 3 + 3 = 6
So, multiplication can be expressed as addition
repeated.
2. Division Operation
The division operation is the reverse of the operation
multiplication.
Take a look at the following multiplication!
8 × 5 = 40, so 40 : 8 = 5
40 : 5 = 8.
30 : 5 = ...
Answer:
Method 1
With the repeated subtraction method
30 : 5 = ...
30 – 5 – 5 – 5 – 5 – 5 – 5 = 0
6 times reduction
So, 30 : 5 = 6.
Method 2
30 : 5 = ...
30 are described as follows.
6 rows
So, 30 : 5 = 6.
5 columns