GR 8 MISCONCEPTION CONCEPTS

S TARTER ACTIVITY

STARTER
A farmer has -3/4 acre of land available for planting carrots. She decides to expand her garden by adding 5/6 acre more. After some thought, she realizes she needs to remove 1/3 acre for a walking path. How much land does she have left for planting?

​L.O.
To subtract two rational numbers and apply it problem solving

Multiple Choice

What is the correct method to subtract rational numbers with the same denominators?

• Subtract the numerators and keep the denominator same.

• Subtract the denominators and keep the numerator same.

• Multiply the numerators and denominators.

• Add the numerators and denominators.

Multiple Select

Which steps are required to subtract rational numbers with different denominators?

• Find the LCM of the denominators

• Convert the fractions to equivalent fractions

• Subtract the numerators and keep the denominators same

• Simplify the fraction

Open Ended

Find the difference: 7/8 - 1/4

Open Ended

What mistake did the student make when subtracting 7/9 - 4/9 and getting 3/18? Write the correct answer.

​Your text here

Multiple Choice

Which of the following is a key step when subtracting rational numbers with unlike denominators?

• Find the LCM of the denominators

• Add the numerators directly

• Multiply the denominators

• Ignore the signs

Open Ended

How much cream will be left over if a chef has 2 1/4 cups of heavy cream and uses 1 5/8 cups for a recipe?

Open Ended

Explain how subtraction of rational numbers can be applied in real-life scenarios, such as cooking or sharing food.