Maths 0.0 / 5 ? Mathematics2D and 3D shapeGCSEEdexcel Created by: Caitlin0803Created on: 08-02-16 17:29 How do you write a number as a product of primes? e.g. 20 Use a prime factor tree. 1 of 15 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. 2 of 15 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. 3 of 15 What formula can you use for compound interest questions? Initial x Multiplier (Time) 4 of 15 How do you cube a number? e.g. 5³ Multiply the number by itself and by itself again. 5 x 5 x 5 = 125 5 of 15 How do you work out 3⁴? 3 x 3 x 3 x 3 = 81 6 of 15 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 7 of 15 What is y³ x y⁵ y⁸ (add the powers) 8 of 15 What is y⁸ ÷ y² y⁸ (multiply the powers) 9 of 15 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 10 of 15 What are the first 10 prime numbers? 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 11 of 15 What are the first 10 square numbers? 1, 4, 9, 16, 25, 36, 49, 64, 81, 100 12 of 15 What are the first 5 cube numbers? 1, 8, 27, 64, 125 13 of 15 Positive X Positive Positive. e.g. 8 x 3 = 24 14 of 15 Positive X Negative Negative. e.g. 5 x -3 = -15 15 of 15
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