# Maths

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How do you write a number as a product of primes? e.g. 20
Use a prime factor tree.
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How do you find the LCM of two numbers? e.g. LCM of 20 and 70
1. Write as a product of primes. 2. Use a venn diagram. 3. Multiply ALL the numbers in the venn diagram.
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How do you find the HCF of two numbers? e.g. HCF of 20 and 70
1. Write as a product of primes. 2. Use a venn diagram. 3. Multiply the numbers in the middle.
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What formula can you use for compound interest questions?
Initial x Multiplier (Time)
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How do you cube a number? e.g. 5³
Multiply the number by itself and by itself again. 5 x 5 x 5 = 125
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How do you work out 3⁴?
3 x 3 x 3 x 3 = 81
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How do you cube root a number? e.g. ³√27
Find what number would be cubed to get the number you are cube rooting. ³√27 = 3
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What is y³ x y⁵
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What is y⁸ ÷ y²
y⁸ (multiply the powers)
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How do you estimate a calculation? e.g. 198.7 x 0.203
Round all numbers to 1 significant figure and then calculate. e.g. 198.7 x 0.203 ≈ 200 x 0.2 = 40
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What are the first 10 prime numbers?
2, 3, 5, 7, 11, 13, 17, 19, 23, 29
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What are the first 10 square numbers?
1, 4, 9, 16, 25, 36, 49, 64, 81, 100
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What are the first 5 cube numbers?
1, 8, 27, 64, 125
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Positive X Positive
Positive. e.g. 8 x 3 = 24
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Positive X Negative
Negative. e.g. 5 x -3 = -15
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## Other cards in this set

### Card 2

#### Front

How do you find the LCM of two numbers? e.g. LCM of 20 and 70

#### Back

1. Write as a product of primes. 2. Use a venn diagram. 3. Multiply ALL the numbers in the venn diagram.

### Card 3

#### Front

How do you find the HCF of two numbers? e.g. HCF of 20 and 70

### Card 4

#### Front

What formula can you use for compound interest questions?

### Card 5

#### Front

How do you cube a number? e.g. 5³