Why does graphite act as a good lubricant on surface of the moon???

Give reason:

PVC is soft and flexible, whereas Bakelite is hard and brittle.

• Take 15 x 13 for an example.
• Always place the larger number of the two on top in your mind.
• Then draw the shape of Africa mentally so it covers the 15 and the 3 from the 13 below. Those covered numbers are all you need.
• First add 15 + 3 = 18
• Add a zero behind it (multiply by 10) to get 180.
• Multiply the covered lower 3 x the single digit above it the "5" (3x5= 15)
• Add 180 + 15 = 195.

Squaring a repeating 6-digit number

1. Choose a number with repeating 6's .
2. The square is made up of:
   • One less 4 than there are digits in the number;
   • One 3;
   • The same number of 5's as 4's;
   • A final 6.

   Example:

1. If the number to be squared is 666:
2. The square has:
   one less 4 than digits in
   the number                 4 4
one 3                             3
same number of 5's as 4's           5 5
a final 6                               6
3. So the square of 666 is 443556.

1. If the number to be squared is 66666:
2. The square has:
   one less 4 than digits in
   the number)                 4 4 4 4
one 3                                  3
same number of 5's as 4's                5 5 5 5
a final 6                                        6
3. So the square of 66666 is 4444355556