Adding the zeros
You move the decimal the amounts of zeros it has to the right. so if the number is 1.8 x 10= you move the decimal one to the right since it has one zero, then you multiply and get 18.0 its easier with a calculator but its still easy :)
In 90 billion, there are 9 zeros. This is because a billion has 9 zeros (1,000,000,000), and when you multiply 90 by a billion, you get 90 billion, which retains the 9 zeros from the billion.
Multiply 4 times 25 to get 100 and then add the two zeros to get 10000
They are 8 times 125 = 1000
Yo make it easy, you cover both the zeros and multiply. 3x5=15 30x50=150
102 zeros.
The same as the number of zeros in 10000, that is, 4.
Adding the zeros
You move the decimal the amounts of zeros it has to the right. so if the number is 1.8 x 10= you move the decimal one to the right since it has one zero, then you multiply and get 18.0 its easier with a calculator but its still easy :)
add 5 zeros. 1*10000 put a 1 in front and throw 5 zeros on the end. as a general rule any number that ends in zeros, you cann multiply the non zero numbers and add the total number of zeros on the end. 30*20 multiply 3 and 2, get 6 then take the two zeros (one from 30 and one from 20) get 600
102.
In 90 billion, there are 9 zeros. This is because a billion has 9 zeros (1,000,000,000), and when you multiply 90 by a billion, you get 90 billion, which retains the 9 zeros from the billion.
When a natural number is multiplied by 1,000, the product is
Multiply 4 times 25 to get 100 and then add the two zeros to get 10000
yes you can just multiply the 8 and the 5 then add all the zeros you have in the 800 to your answer. EX. 8x5=45 <-- your answer then add the 2 zeros your final answer is 4500
A million times a million is a trillion, or 1,000,000,000,000. In this particular case, the shortcut is to add your zeros. When you multiply a number with 6 zeros with another number with 6 zeros, it will always have 12 zeros. In other similar problems beginning with numbers other than 1 or with more than one starting digit that is not a zero, you can just multiply the non-zero part at the beginning and then add the zeros from both multiplicands onto the end of the product, thus 60 x 200 would be 12,000. That is, you multiply the 6 and the 2 and add on the 3 zeros.