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Adding and Subtracting Fractions
Adding and Subtracting Mixed Numbers
Comparing and Ordering Decimals
Comparing and Ordering Numbers
Conversions Between Mixed and Improper Fractions
Dividing by 10,100, 100
Dividing Fractions and Mixed Numbers
Estimating Sums and Differences
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An often used way to search for common factors is a T-Chart. Here is how you get started.
Lets take 30 as an example . First , you list 30 at the top of the T-Chart. Second, start finding the factors of 30. We know that one goes into every number as a factor, so 1 and 30 are factor pairs. Third, the second number that goes into 30 is 2 because 2x15 is 30. We know 2 works because 30 is even. Fourth, the next number that goes into thirty is 3 because 3 x 10= 30 because 10 x anything equals that number with a zero on the end. Fifth, 4 won't go into 30 so you cant use 4. 4 times 7 is 28 and 4 times 8 is 32. Seventh, 5 goes into thirty 6 times. We knew 5 would work because the number ends in a zero. Finally
, we can tell we are done because when we try 6 the numbers cross over. ln thirties T-chart 5 x 6= 30 and 6 x 5=30 too. Because they cross over that tells you that you have found all the factors of 30.
Here is another example of a T-chart using the number 20.
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