A power means the number is mulitplied by itself the "power" number of times
Thus
2 to the power 2 is the same as 2*2
2 to the power 3 is the same as 2*2*2
2 to the power 5 is the same as 2*2*2*2*2
So 2 to the power 40 is the same as 2*2*2....*2 (with 40 twos), which = 1099511627776
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2 to the 40th power is the same as 2 times itself 40 times.
To find the unit digit of 2 raised to the power of 40, we can observe a pattern. The unit digit of powers of 2 cycles in a pattern: 2, 4, 8, 6. Since 40 is a multiple of 4, the unit digit of 2^40 will be the fourth number in the pattern, which is 6. Thus, the unit digit of 2^40 is 6.
40 to the 8th power equals 6,553,600,000,000
64-16=48 48-8=40 40-4=36 36-2=34 So, you're subtracting 2 to the fourth power, then 2 to the third, then 2 to the second, then 2 to the first.
There are various examples (since 40 has 6 proper divisors, or 8 in total), but the most simple is grouping it into a power of each value:40/ \ 8 5 /|\ 2 2 2Thus, we can conclude that 40 = 23 * 5.