0, 1, 2, 3 and 4
6
24680
You need to regroup when you add the numbers together and they add up to a number that is ten or more. For example: 1 164 +518 _____ 682 If it is over ten, take the first digit of the number and put it above the next number. Then, add that number onto the sum of the other digits underneath it.
5040
99.998 rounding to the tenth place is 100. The hundredths digit is a 9, so you round up to 0 and regroup it to the tenth. The tenths digit is a 9 and regrouping would make the tenths digit a 0 too. This happens with the ones and tens digit. All the 9's regroup to 0's making the answer 100.
15
only 2
No. It depends on how good you are at arithmetic.
because 1 is toobig
4
2
6 times
It is possible to create a 3-digit number, without repeated digits so the probability is 1.
6
by one by one
24680
You need to regroup when you add the numbers together and they add up to a number that is ten or more. For example: 1 164 +518 _____ 682 If it is over ten, take the first digit of the number and put it above the next number. Then, add that number onto the sum of the other digits underneath it.