Percentages & Financial Maths

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Last updated 1:16 AM on 8/12/26
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16 Terms

1
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How do you carry out a percentage increase without a calculator?
1. Calculate the percentage of the original amount. 2. ADD it to the original amount.
2
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What is the calculator formula to calculate a percentage increase?
New Value = Original Value * (1 + Percentage / 100)
3
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How do you increase £250 by 15% using a multiplier?
Multiplier = 1 + 0.15 = 1.15. Calculation: 250 * 1.15 = £287.50.
4
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How do you carry out a percentage decrease without a calculator?
1. Calculate the percentage of the original amount. 2. SUBTRACT it from the original amount.
5
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What is the calculator formula to calculate a percentage decrease?
New Value = Original Value * (1 - Percentage / 100)
6
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How do you decrease £180 by 20% using a multiplier?
Multiplier = 1 - 0.20 = 0.80. Calculation: 180 * 0.80 = £144.
7
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What is a percentage multiplier?
A single decimal value used to calculate a percentage change in one single multiplication step.
8
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What are the multipliers for: +5%, +24%, -8%, -35%, and +2.5%?
+5% = 1.05 | +24% = 1.24 | -8% = 0.92 | -35% = 0.65 | +2.5% = 1.025
9
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What is simple interest?
Interest calculated ONLY on the original principal amount each year (it does NOT compound).
10
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What is the formula for calculating simple interest and total amount?
Interest = (Principal * Rate * Time) / 100 | Total = Principal + Interest
11
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How do you calculate the total value of £500 invested at 4% simple interest for 3 years?
Interest/yr = 4% of £500 = £20. Total interest = £20 * 3 = £60. Total = £500 + £60 = £560.
12
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When do you need to use a reverse percentage method?
When you are given a FINAL value after a percentage change and need to work backward to find the ORIGINAL (100%) value.
13
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What is the formula to find the original value using reverse percentages?
Original Value = New Value / Multiplier
14
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How do you find the original price of a jacket that costs £68 after a 15% discount?
Multiplier = 1 - 0.15 = 0.85. Original Price = 68 / 0.85 = £80.
15
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If 35% of a number is 140, how do you find the original number (100%)?
1. Find 1% -> 140 ÷ 35 = 4. 2. Find 100% -> 4 * 100 = 400.
16
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If 4/7 of a water tank contains 320 L, how do you find the total capacity?
1. Find 1/7 -> 320 ÷ 4 = 80 L. 2. Find 7/7 -> 80 * 7 = 560 L.