Let x = abc be a 3-digit number. The expanded for of x is 100*a + 10*b + c.And let y = de = 10*d + e be a 2-digit number.
Then x*y =
1000*a*d + 100*a*e + 100*b*d + 10*b*e + 10*c*d + c*e
= 1000*a*d + 100*(a*e + b*d) + 10*(b*e + c*d) + c*e.
Practice!
15
there are no 3 digit tis two digit! :) * * * * * 90 of them.
421 and 842
The first three-digit number is 100. It is the smallest integer that has three digits, starting from 1 and followed by two zeros. Numbers below 100, such as 99, are considered two-digit numbers.
To multiply two digit numbers, multiply each place value of a factor by each place value digit and add the results.
Multiply the three-digit number by the one's digit, or last digit, of the two-digit number. That is your first part. Now multiply by the second-to-last digit, or ten's digit, and multiply the result by 10. That is your second part. Add the two parts and that is your answer.
Practice!
99*99=9801
To multiply two digit decimal numbers, multiply the numbers as you would without the decimals. To put the decimal in the answer, count the number of decimal places in the two numbers and put the decimal in the answer that many places to the left. For example: 5.12 x 6.35 = 32.5120. If the numbers were 51.2 x 63.5, the answer would be 3251.20.
There are only 999 three digit whole numbers.
15
there are no 3 digit tis two digit! :) * * * * * 90 of them.
421 and 842
There are 28706 such combinations. 5456 of these comprise three 2-digit numbers, 19008 comprise two 2-digit numbers and two 1-digit numbers, 4158 comprise one 2-digit number and four 1-digit numbers and 84 comprise six 1-digit numbers.
The first three-digit number is 100. It is the smallest integer that has three digits, starting from 1 and followed by two zeros. Numbers below 100, such as 99, are considered two-digit numbers.
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