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Published byCody O’Brien’ Modified over 7 years ago

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Find a Percentage of a Number SWBAT use the percent formula to find a percentage of a number; use a percent proportion to find a percentage of a number

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Think If Josie finds the perfect pair of shoes that are originally $29.99, but are on sale at 10% off, how much money will she save?

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Percent Formula Percentage Formula Rate (r) · Base (b) = Percentage (p) Rate (r) · Base (b) = Percentage (p) rb=p rb=p Write the percent as a decimal (rate) Write the percent as a decimal (rate) Multiply it by the whole number (base) Multiply it by the whole number (base) This gives the percentage of the number This gives the percentage of the number

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Percent Proportion percentage percent percentage percent base 100 base 100 Use cross products and solve for the percentage Use cross products and solve for the percentage =

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Examples 40% of 45 3% of 80 111% of 32 0.6% of 30 60% of 40 115% of 90 8% of 260 0.4% of 50

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Try These 28% of 2800.28 · 2800.28 · 2800 784 784 0.2% of 4750.002 · 4750.002 · 4750 9.5 9.5 300% of 92 3 · 92 3 · 92 276 276 28% of 2800 x/2800 = 28/100 100x = 78400 784 0.2% of 4750 x/4750 =.2/100 100x = 950 9.5 300% of 92 x/92 = 300/100 100x = 27600 276

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