what pattern can you use to multiply a number and 9 if you know 10 times the number? give an example.
9x10=90
9 x 11 = 110 - 11
9x10=90
To multiply a number by 9 when you know 10 times the number, you can subtract the number from 10 times the number. It's like inviting the number to a party, but then one person doesn't show up. Let's take an example to understand it better. If we have 10 times the number as 60, we can find 9 times the number by subtracting the number itself, like this:
10 times the number = 60
Number = 6 (60 divided by 10)
9 times the number = 60 - 6 = 54
So, when you have 10 times the number, simply subtract the number itself to find 9 times the number! It's like magic, but with math.
To multiply a number by 9 when you know the result of multiplying the number by 10, you can use the following pattern:
1. Subtract the number from the result of multiplying it by 10.
2. The difference will be the product of the number multiplied by 1.
Let's take an example to understand this pattern better:
Suppose you want to multiply a number, say 7, by 9 when you know that 10 times the number is equal to 70.
1. Subtract the number (7) from the result of multiplying it by 10 (70 - 7).
70 - 7 = 63
2. The difference (63) is the product of the number (7) multiplied by 9.
Therefore, when 10 times the number is 70, multiplying the number by 9 gives you the result of 63.
In summary:
9 x 10 = 90
9 x 7 (using the pattern) = 63