wikiHow Mental Math Practice Problems Addition Practice Problems: 1. 25 + 34 = 2. 110 + 85 = 3. 1,237 + 564 = 4. 6.7 + 2.9 = 5. -15 + 38 = 6. 1/4 + 3/8 = 7. 4√3 + 2√2 = 8. 3.14 + 1.59 = 9. 2.3 + (-4.6) = 10. 10,000 + 5,678 = Subtraction Practice Problems: 1. 86 - 37 = 2. 240 - 112 = 3. 1,560 - 928 = 4. 7.5 - 2.3 = 5. -20 - 15 = 6. 7/8 - 3/4 = 7. 5√2 - √3 = 8. 7.32 - 4.97 = 9. 3.8 - (-2.4) = 10. 30,000 - 9,876 = Multiplication Practice Problems: 1. 6 x 8 = 2. 25 x 13 = 3. 123 x 456 = 4. 1.5 x 2.7 = 5. (-6) x 5 = 6. 2/3 x 3/4 = 7. (5 + √2) x (3 - √5) = 8. 2.5 x 3.2 = 9. (-2.6) x (-1.5) = 10. 10,000 x 0.23 = Division Practice Problems: 1. 72 ÷ 9 = 2. 450 ÷ 25 = 3. 1,728 ÷ 18 = 4. 6.3 ÷ 2.1 = 5. 50 ÷ (-5) = 6. 2/5 ÷ 3/8 = 7. (2√5 + 3) ÷ (5 - √5) = 8. 10.5 ÷ 3.5 = 9. (-12.6) ÷ 2.1 = 10. 18,000 ÷ 12 = Percentage Practice Problems: 1. What is 15% of 200? 2. 40 is what percentage of 200? 3. If a shirt originally costs $40 and is now on sale for $28, what is the percentage discount? 4. If you scored 80 out of 100 on a test, what percentage did you score? 5. If a recipe calls for 2 cups of flour and you want to make half the recipe, how many cups of flour do you need? 6. What is a 12% increase from $75? 7. If a company earned $20,000 in revenue and had $5,000 in expenses, what is the profit margin as a percentage? 8. If you have a 20% off coupon and a $50 item, what is the final price? 9. If you have 30 red marbles and 70 blue marbles, what percentage of the marbles are red? 10. If a basketball player made 80 out of 100 free throws, what percentage did they make? Page