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Big Ideas Math: Modeling Real Life, Grade 7
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Big Ideas Math: Modeling Real Life, Grade 7 View details
5. Subtracting Rational Numbers
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Exercise 1 Page 30

Subtracting a number is the same as adding its opposite.

2/3

Practice makes perfect

We want to find the difference. Let's look at the given expression! 1/3-( - 1/3)We can recall that subtracting a number is the same as adding its opposite. 1/3-( - 1/3)= 1/3+1/3 Now, we can find the sum of two numbers with the same sign. We can do so by finding the sum of their absolute values.

|1/3|+|1/3|
AbsPos

|1/3|=1/3

1/3+1/3
AddFrac

Add fractions

1+1/3
AddTerms

Add terms

2/3

Notice that both numbers in our expression have a positive sign. This means that that the difference is also a positive number.

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