How about 5 x 9 x enough multiples of 10 to give you 5 digits? 5 x 9 = 45 5 x 9 x 10 = 450 5 x 9 x 10 x 10 = 4500 5 x 9 x 10 x 10 x 10 = 45000 18225
8 is twice as big as 4. 9 x 8 is twice as big as 9 x 4.
√(7290) √(81) x √(90) 9 x √(9) x √(10) 9 x 3 x √(10) 27√10
9 - x ≥ 10 9 ≥ 10 + x -1 ≥ x or x ≤ -1
It is: 4.53*10^9
How about 5 x 9 x enough multiples of 10 to give you 5 digits? 5 x 9 = 45 5 x 9 x 10 = 450 5 x 9 x 10 x 10 = 4500 5 x 9 x 10 x 10 x 10 = 45000 18225
8 is twice as big as 4. 9 x 8 is twice as big as 9 x 4.
99 x 10 - 99 x 9 = 99(1 x 10 - 1 x 9) = 99(10 - 9) = 99(1) =99
√(7290) √(81) x √(90) 9 x √(9) x √(10) 9 x 3 x √(10) 27√10
0.0000009 in Scientific Notation = 9 x 10-7
9 x 4 x 10 = 360
9 - x ≥ 10 9 ≥ 10 + x -1 ≥ x or x ≤ -1
1-digit: 9 2-digit: 9 3-digit: 9 x 10 = 90 4-digit: 9 x 10 = 90 5-digit: 9 x 10 x 10 = 900 6-digit: 9 x 10 x 10 = 900
It is: 4.53*10^9
First 9 X 10 is easy to calculate. Any number times 10 is that number with a 0 added.9 X 10 = 90Then you just add the 9 to it to have the same answer as if you multiplied 9 X 11.90 + 9 = 99or9 X 11 = 99
2/9 = 0.2222222222 = 2 x 10^-1 + 2 x 10^-2 + 2 x 10^-3 + 2 x 10^-4 + 2 x 10^-5 + 2 x 10^-6 + 2 x 10^-7 + 2 x 10^-8 + 2 x 10^-9 + 2 x 10^-10
0.2 x 300 x 10^9 = 2 x 30 x 10^9 = 6 x 10^10 = 60,000,000,000