Flashcards
NUMBER
Cards in this deck (16)
- 1WHAT ARE THE FIRST 15 SQUARE NUMBERS1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225
- 2WHAT ARE THE FIRST 5 CUBE NUMBERS1 8 27 64 125
- 3WHAT DO ALL PRIME NUMBERS END INApart from 2 and 5, all Prime Numbers end in 1,3,7 or 9 - Not all numbers that end in these are prime however
- 4WHAT IS A MULTIPLEExamples:
• 12 is a multiple of 3, as 3 × 4 = 12
• −6 is a multiple of 3, as 3 × −2 = −6
• But 7 is NOT a multiple of 3 - 5WHAT ARE FACTOR TREES ?A method used to find a numbers prime factors, For example:
- 6WHAT IS THE LCMThe lowest common multiple is the smallest number that will divide by all of the numbers in the question
- 7HOW TO FIND THE LCMExample: Find the LCM of 4, and 6
Multiples of 4 are: 4, 8, 12, 16, 20, 24...
Multiples of 6 are: 6, 12, 18, 24, 30, 36...
The LCM is 12 - 8WHAT IS THE HCFThe highest common factor is the biggest number that will divide into all of the numbers in the question
- 9HOW TO FIND THE HCFHCF of 108 and 24
Find their prime factors (Factor tree)
2 × 2 × 2 × 3 = 24
2 × 2 × 3 × 3 × 3 = 108
Then multiply the common ones together
2×2×3 = 12
The greatest common factor will be 12 - 10HOW TO MULTIPLY A FRACTIONStep 1. Multiply the top numbers
Step 2. Multiply the bottom numbers
Step 3. Simplify the fraction
- 11HOW TO DIVIDE A FRACTIONStep 1. Turn the second fraction upside down ( It is now a reciprocal)
Step 2. Multiply the first fraction by that
Step 3. Simplify the fraction (if needed)
- 12HOW TO ADD FRACTIONSStep 1: Make the denominators the same
Step 2: Add the numerators
Step 3: Simplify the fraction (if needed)
- 13HOW TO SUBTRACT FRACTIONSStep 1: Make the denominators the same
Step 2: Subtract the numerators
Step 3: Simplify the fraction (if needed)
- 14HOW DO WE CONVERT FROM PERCENT TO DECIMALdivide by 100 and remove the "%" sign
- 15PERCENTAGES 15% of £4615% = 15 / 100 = 0.15
0.15 x £46 = £6.90 - 16PERCENTAGES A TOASTER IS REDUCED IN PRICE BY 40%, IT ORIGINALLY COSY £68, WHAT IS THE NEW PRICE OF THE TOASTER40% = 40 ÷ 100 = 0.4
0.4 x £68 = £27.20
£68 - £27.20 = £40.80
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- GCSE Mathematics Flashcards on NUMBER, created by mayaleggett on 16/03/2016.
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- mayaleggett
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