Grade 8 Mental Math Mastery

Grade 8 Mental Math Mastery

Read each question carefully and solve it using mental math strategies. Try to avoid using a calculator or writing down intermediate steps. Show your final answer in the space provided.

1. What is 15% of 80?  

2. Calculate 25 × 32 mentally.  

3. What is 720 ÷ 9?  

4. Find the sum of 1.75 and 2.25.  

1. Which of the following is the best estimate for 49.8 × 3.1?

2. Approximately, what is the square root of 65?

1. 3/4 + 1/2 = 1.25

2. (8 + 4) × 2 = 8 + (4 × 2)

1. If a shirt costs $25 and is on sale for 20% off, what is the new price?

2. A recipe calls for 1.5 cups of flour. If you want to make 3 times the recipe, how much flour do you need?

1. Plot the result of 5 + (-8) on the number line below.

2. What is the distance between -3 and 7 on a number line?