Rules for Subtracting Rational Numbers

This video tutorial covers the rules of subtraction using the keep-change-opposite method. It explains how to handle different scenarios such as negative subtract positive, positive subtract negative, positive subtract positive, and negative subtract negative. The video provides examples and encourages viewers to practice the method to ensure understanding and success in solving subtraction problems.

What is the first step in the 'keep change opposite' method?

• Change the first number

• Change subtraction to addition

• Ignore the signs

• Add the numbers directly

When using the 'keep change opposite' rule, what do you do with the second number?

• Change it to its opposite

• Keep it the same

• Subtract it from the first number

• Add it directly

How do you handle decimals when using the 'keep change opposite' rule?

• Ignore the decimal points

• Round them to the nearest whole number

• Align the decimal points before adding

• Convert them to fractions

What is the result of subtracting a negative number from a positive number?

• Zero

• It depends on the values

• A positive number

• A negative number

When subtracting two positive numbers, how do you determine the sign of the result?

• Always negative

• The sign of the smaller number

• Always positive

• The sign of the larger number

What is the common denominator for fractions 1/2 and 6/7?

• 7

• 21

• 14

• 12

In the 'keep change opposite' method, what do you do if both numbers have the same sign?

• Change both signs to positive

• Subtract the smaller from the larger

• Ignore the signs

• Add the absolute values and keep the sign

How do you determine the sign of the result when subtracting two negative numbers?

• Always positive

• Always negative

• The sign of the larger absolute value

• The sign of the smaller absolute value

What is the result of subtracting -5 from -2.5?

• 2.5

• -7.5

• 3.3

• 7.5

What is the common denominator for fractions 3/5 and 5/6?

• 10

• 25

• 15

• 30