You divide by 1000000. This is because there are 1000000 nanograms in a milligram. Therefore 21 nanograms is 0.000021 milligrams.
One kilometre is equal to 1000 x 1000 = 1000000 millimetres. Therefore, 21 kilometres is equal to 21 x 1000000 = 21000000 millimetres.
ZERO
1000100
1000445
just add to the first number the number of zeros from the second number1000000000000
3/4million*1000000
1000 times
2 + (2/45) x 1000000 = 44,446.4 recurring (that is, 44,446.44444...)
To find the number add the two numbers together. You should be able to do it in your head. 6000007 + 1000000 = 7000007.
6a add 21 = 27
1000000 1000000 1000000 1000000 1000000 1000000