If you include 00 then 10, otherwise 9.
There are no pairs of 2-digit numbers with a difference of 90 if both numbers are positive or both negative. However, with one positive and one negative, there are 71 pairs.
3
There are 278 5-digit numbers less than 20,000 that are divisible by both four and nine.
300
17
There are 5760 such numbers.
16.2 16 digit numbers and 2 digit decimal places.
There are no pairs of 2-digit numbers with a difference of 90 if both numbers are positive or both negative. However, with one positive and one negative, there are 71 pairs.
3
There are 278 5-digit numbers less than 20,000 that are divisible by both four and nine.
300
17
How many two digit numbers are there in which the tens digit is greater than the oneβs digit ?
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 five numbers: 18, 36, 54, 72, 90.
No digit that is 5 places long is equal to 6 times 2 other than 12.000
None. 3 digit numbers are not divisible by 19 digit numbers.