Certainly! Let's find the square of each given number step by step. Squaring a number means multiplying the number by itself:
### (a) 20
To find the square of 20:
[tex]\[ 20 \times 20 = 400 \][/tex]
So, the square of 20 is 400.
### (b) 10
To find the square of 10:
[tex]\[ 10 \times 10 = 100 \][/tex]
So, the square of 10 is 100.
### (c) 30
To find the square of 30:
[tex]\[ 30 \times 30 = 900 \][/tex]
So, the square of 30 is 900.
### (d) 50
To find the square of 50:
[tex]\[ 50 \times 50 = 2500 \][/tex]
So, the square of 50 is 2500.
### (e) 70
To find the square of 70:
[tex]\[ 70 \times 70 = 4900 \][/tex]
So, the square of 70 is 4900.
In summary, the squares of the given numbers are:
- 20: 400
- 10: 100
- 30: 900
- 50: 2500
- 70: 4900
