Subtracting Rational Numbers for Grade 7 Using The Number System

This video tutorial covers the subtraction of rational numbers, including fractions, mixed numbers, and decimals. It explains the concept of subtracting by adding the opposite and provides step-by-step examples for each type of number. The tutorial emphasizes finding common denominators for fractions and mixed numbers and highlights the importance of keeping track of signs when dealing with decimals. The video concludes with a recap of the key points and encourages viewers to practice the steps for mastering the subtraction of rational numbers.

What is the key concept to remember when subtracting rational numbers?

• Subtracting a number is the same as adding it twice.

• Subtracting a number is the same as dividing it by two.

• Subtracting a number is the same as adding its opposite.

• Subtracting a number is the same as multiplying it by zero.

How do you solve +5/11 - +7/11?

• +2/11

• -2/11

• +12/11

• -12/11

When subtracting fractions with different denominators, what is the first step?

• Subtract the denominators.

• Find a common denominator.

• Add the numerators directly.

• Multiply the fractions.

What is the result of -1 3/8 - -8 1/2?

• +7 1/8

• -7 1/8

• +9 1/8

• -9 1/8

How do you handle the subtraction of decimal numbers like +2.4 - +5.6?

• Multiply the numbers.

• Add the opposite of the second number.

• Subtract the numbers directly.

• Add the numbers directly.

What is the final answer for -3.1 - +4.8?

• -1.7

• +1.7

• -7.9

• +7.9

What is the result of -0.45 - -0.05?

• -0.40

• +0.50

• +0.40

• -0.50