Decimals and Percents Flashcards
Free decimals and percents flashcards covering place value, rounding, decimal operations, percent of a number, percent change and common conversions. Flip each card, mark what you know and drill what you miss.
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Decimal place value
| Question | Answer |
|---|---|
| What is the place value of the 3 in 0.347? | Tenths (0.3). |
| What is the place value of the 7 in 0.347? | Thousandths (0.007). |
| How do you read 0.25? | Twenty-five hundredths. |
| How do you compare decimals? | Line up the decimal points and compare digit by digit from the left. 0.4 > 0.39. |
| Round 3.846 to the nearest tenth. | 3.8 |
| Round 3.846 to the nearest hundredth. | 3.85 |
| What does multiplying by 10 do to a decimal? | Moves the decimal point one place right. 0.34 × 10 = 3.4. |
| What does dividing by 100 do to a decimal? | Moves the decimal point two places left. 45 ÷ 100 = 0.45. |
Decimal operations
| Question | Answer |
|---|---|
| How do you add or subtract decimals? | Line up the decimal points, then add or subtract as with whole numbers. |
| How do you multiply decimals? | Multiply as whole numbers, then place the decimal so the product has as many decimal places as both factors combined. 0.3 × 0.2 = 0.06. |
| How do you divide by a decimal? | Move the decimal in the divisor and dividend the same number of places until the divisor is whole. 1.2 ÷ 0.4 = 12 ÷ 4 = 3. |
| 0.5 + 0.25 = ? | 0.75 |
| 2 − 0.35 = ? | 1.65 |
| 0.6 × 0.7 = ? | 0.42 |
Fractions, decimals and percents
| Question | Answer |
|---|---|
| What does percent mean? | Per hundred. 45% = 45/100. |
| Convert a percent to a decimal. | Divide by 100 (move the decimal two places left). 35% = 0.35. |
| Convert a decimal to a percent. | Multiply by 100. 0.08 = 8%. |
| 1/2 = ? as a decimal and percent | 0.5 and 50% |
| 1/4 = ? | 0.25 and 25% |
| 3/4 = ? | 0.75 and 75% |
| 1/5 = ? | 0.2 and 20% |
| 1/10 = ? | 0.1 and 10% |
| 1/3 = ? | 0.333… and about 33.3% |
| 2/3 = ? | 0.666… and about 66.7% |
| 1/8 = ? | 0.125 and 12.5% |
| 3/8 = ? | 0.375 and 37.5% |
Percent problems
| Question | Answer |
|---|---|
| How do you find a percent of a number? | Convert the percent to a decimal and multiply. 15% of 60 = 0.15 × 60 = 9. |
| What is 10% of 85? | 8.5 (move the decimal one place left) |
| What is 50% of 46? | 23 |
| What is 25% of 80? | 20 |
| Percent formula (part, whole)? | Percent = part / whole × 100 |
| What percent of 40 is 10? | 25% (10 / 40 × 100) |
| Percent increase formula? | (new − old) / old × 100 |
| Price rises from $50 to $60. What is the percent increase? | 20% |
| A $40 item is 25% off. What is the sale price? | $30 (40 × 0.75) |
| How do you add a 15% tip to $20? | 20 × 1.15 = $23, or 20 + 3 = $23. |
| Simple interest formula? | I = P × r × t |
Frequently asked questions
How do you turn a decimal into a percent?
Multiply by 100 or move the decimal point two places to the right, then add the percent sign.
What is the quickest way to find 15 percent?
Find 10 percent by moving the decimal one place left, find 5 percent as half of that, then add them.
Sources
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