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Rounding
Line up numbers underneath each other, making sure the decimal is in the same row
Check the number you are rounding and then the number behind it
Remove any digits that are behind the digit you rounded
If the number behind it is less than 5 then keep the digit you wish to round the same, if the number behind it is 5 or more than increase the digit you wish to round by one
Addition
Subtract the numbers
Subtraction
Add the numbers
Keep the decimal in the same row in the answer
Decimals
First, do the multiplication without decimal point
The second number must be a whole number so times it by 10, 100, 1000...
Division
Times the first number by what you times the second number behind (E.G.: if you times the second number by 10 you would times the first number by 10)
Multiplication
Count how many decimal places were in the question
E.G. 2.154 has 3 decimal places and is an terminating decimal
E.G. 3.333... has infinite decimal places and is a reoccurring decimal
Move the decimal place that many places to the left in the answer
Now divide the two new numbers for your answer
Terminating decimals are decimals that end and have a certain amount of decimal places
reoccurring decimals are decimals with infinite decimal places that is/are the same number/s
Terminating and reoccurring decimals