Write the units digit of the cube of each of the following numbers:31,

1.	Write the units digit of the cube of each of the following numbers:31, 109, 388, 4276, 5922, 77774,
Answer» i) 31 = Unit digit of 31 is 1 Cube of 1, = 1³ = 1 ∴ Unit digit of cube of 31 is always 1 ii) 109 Unit digit of 109 is = 9 Cube of 9, = 9³ = 729 ∴ Unit digit of cube of 109 is always 9 iii) 388 Unit digit of 388 is = 8 Cube of 8, = 8³ = 512 ∴ Unit digit of cube of 388 is always 2 iv) 4276 Unit digit of 4276 is = 6 Cube of 6 = 6³ = 216 ∴ Unit digit of cube of 4276 is always 6 v) 5922 Unit digit of 5922 is = 2 Cube of 2, = 2³ = 8 ∴ Unit digit of cube of 5922 is always 8 vi) 77774 Unit digit of 77774 is = 4 Cube of 4, = 4³ = 64 ∴ Unit digit of cube of 77774 is always 4

Write the units digit of the cube of each of the following numbers:31, 109, 388, 4276, 5922, 77774,

Answer»

i) 31

= Unit digit of 31 is 1

Cube of 1,

= 1³

= 1

∴ Unit digit of cube of 31 is always 1

ii) 109

Unit digit of 109 is = 9

Cube of 9,

= 9³

= 729

∴ Unit digit of cube of 109 is always 9

iii) 388

Unit digit of 388 is = 8

Cube of 8,

= 8³

= 512

∴ Unit digit of cube of 388 is always 2

iv) 4276

Unit digit of 4276 is = 6

Cube of 6

= 6³

= 216

∴ Unit digit of cube of 4276 is always 6

v) 5922

Unit digit of 5922 is = 2

Cube of 2,

= 2³

= 8

∴ Unit digit of cube of 5922 is always 8

vi) 77774

Unit digit of 77774 is = 4

Cube of 4,

= 4³

= 64

∴ Unit digit of cube of 77774 is always 4