# Key Maths Facts to Memorise Question and Answer

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1 Key Maths Facts to Memorise Question and Answer Ways of using this booklet: 1) Write the questions on cards with the answers on the back and test yourself. 2) Work with a friend to take turns reading a random question and answering. 3) Ask a friend or family member to test you by reading questions (on the lefthand side) to you. The questions are on the left-hand side of each page and the answers are on the right.

2 Times Table Facts 1) What is 6 6? 36 2) What is 6 7? 42 3) What is 6 8? 48 4) What is 6 9? 54 5) What is 7 7? 49 6) What is 7 8? 56 7) What is 7 9? 63 8) What is 8 8? 64 9) What is 8 9? 72 10) What is 9 9? 81 11) What is 36 6? 36 12) What is 42 7? 6 13) What is 48 8? 6 14) What is 54 9? 6 15) What is 49 7? 7 16) What is 56 8? 7 17) What is 63 9? 7 18) What is 64 8? 8 19) What is 72 9? 8 20) What is 81 9? 9 21) What is 3 squared? 9 22) What is 4 squared? 16 23) What is 5 squared? 25 24) What is 6 squared? 36 25) What is 7 squared? 49 26) What is 8 squared? 64 27) What is 9 squared? 81 28) What is 10 squared? ) What is the square root of 9? 3 30) What is the square root of 16? 4 31) What is the square root of 25? 5 32) What is the square root of 36? 6 33) What is the square root of 49? 7 34) What is the square root of 64? 8 35) What is the square root of 81? 9 36) What is the square root of 100? 10 D Watkins 2016 Page 2

3 Whole Numbers, Multiply and Divide 37) How many zeroes are there in a million? Six 38) How many zeroes are there in a billion? Nine 39) What is the answer when you multiply any number by 1? 40) What is the answer when you multiply any number by 0? 41) What is a multiple? 42) What is a factor? 43) What is a prime number? The same number 44) How do you square a number? Multiply by itself 45) BODMAS: what sum do you have to do first: add, subtract or multiply? 46) BODMAS: what sum do you have to do last: divide, multiply or add? 0 A number which is in the times table of another number A number which divides into another number without a remainder A number with only two factors: itself and one Multiply Add Fractions 47) How do you work out a fraction of an amount? 48) What is the proper name for the number on top of a fraction? 49) What is the proper name for the number on the bottom of a fraction? 50) How do you add or subtract two fractions with the same numbers on the bottom? 51) How do you add or subtract two fractions with different numbers on the bottom? Divide by the bottom and multiply by the top Numerator Denominator Keep the numbers on the bottom the same, and add the numbers on the top. The kiss and smile method. D Watkins 2016 Page 3

5 Statistics 69) If you are asked to draw a frequency table, what does this mean? 70) How do you find the mean? A tally chart a) Add all the numbers together b) Divide by how many numbers there are 71) How do you find the range? Highest take away Lowest 72) How do you find the mode? The most frequent number 73) How do you find the median? The middle number 74) What do you have to do before you can find the median? 75) If the mean, median or mode is higher, what comment can you make? 76) If the mean, median or mode is lower, what comment can you make? 77) If the range is higher, what comment can you make? 78) If the range is lower, what comment can you make? 79) In a scatter graph, does a line of best fit need to go through the origin? 80) If a scatter graph question asks you to estimate what do you do? Put the numbers in order On average the numbers are higher On average the numbers are lower The numbers are more varied The numbers are more consistent No Use your line of best fit to read off the graph Measurement 81) How many centimetres are in a metre? ) How many metres are in a kilometre? ) How many millimetres are in a centimetre? 10 84) How many grams are in a kilogram? ) How many kilograms are in a tonne? ) How many millilitres are in a litre? ) How many centimetres cubed are in a litre? 1000 D Watkins 2016 Page 5

6 88) When do you use squared units e.g. centimetres squared (cm²) or metres squared (m²)? 89) When do you use cubed units e.g. metres cubed (m³) or centimetres cubed (cm³)? Perimeter, Area Volume When you are working out an area (or when the formula begins A = When you are working out an volume (or when the formula begins V = 90) What is the formula for the volume of a cuboid? 91) What is the formula for the area of a rectangle? 92) How do you find the perimeter of a shape? 93) How do you find the area of a triangle? 94) What is the formula for the area of a circle? 95) What is the formula for the circumference of a circle? 96) If you are told the radius, how do you find the diameter of a circle? 97) If you are told the diameter, how do you find the radius of a circle? V LBH (or Length times Breadth times Height ) A LB (or Length times Breadth ) Add all the lengths together Half Base times Height (or A C BH A ) 2 (A equals B H over 2) 2 r (A equals pi r squared) d (C equals pi d) Double it Half it 98) What is the formula for speed? Time Distance Speed (or Time D S ) T 99) What is the formula for distance? Distance Speed Time (or D ST ) 100) What is the formula for time taken? 101) How do you write 15 minutes in hours using a decimal point? 102) How do you write 45 minutes in hours using a decimal point? Distance Time (or T Speed D ) S D Watkins 2016 Page 6

7 103) From a scale drawing, how do you find the real-life length? Direction and Scale a) Measure with a ruler b) Multiply by the number in the scale c) Write units on the end of your answer 104) What do you need to remember when drawing or measuring a three-figure bearing on a diagram? 105) From a real-life situation, how do you find the length to draw in a scale drawing? 106) From a scale drawing, how do you find the real-life length? a) Must start with zero at North b) Must measure clockwise Divide by the number in the scale Multiply by the number in the scale Angle 107) What do the three angles in a triangle always add up to make? 108) What do the four angles in a quadrilateral always add up to make? 180 degrees 360 degrees 109) How many degrees in a full turn? ) How many degrees in a half turn? ) How many degrees in a straight angle? ) How many degrees in a right angle? ) What do the three angles in a triangle always add up to make? 114) What is the name of the type of angle that is less than 90 degrees? 115) What is the name of the type of angle that is bigger than a right angle and less than a straight angle? 116) What is the name of the type of angle that is bigger than a straight angle? 180 degrees Acute angle Obtuse angle Reflex angle D Watkins 2016 Page 7

8 Money 117) What type of sum do you do to work out a discount? Take away 118) What does income mean? The money you get in 119) What does expenditure mean? The money you spend 120) How do you work out Total Expenditure? 121) What sum do you do with income and expenditure to work out how much money is left over? Add all the numbers together Income take away expenditure 122) What are deductions from pay? Tax, National Insurance etc. 123) What does gross pay mean? 124) What does net pay mean? The amount you get paid before deductions are taken off The amount you get paid after deductions are taken off 125) How do you work out net pay? Take the Deductions away from the Net Pay 126) How do you work out how much somebody gets paid when you know how many hours they have worked? 127) If you get time-and-a-half for overtime, what do you multiply the pay by? 128) If you get double time for overtime, what do you multiply the pay by? 129) How do you find monthly instalments on a loan? 130) When using exchange rates, how do you decide whether to multiply or divide? Hourly pay number of hours a) Calculate the interest as a percentage b) Add on the interest to the original amount c) Divide by the number of months Multiply when changing into foreign money, divide when changing back into pounds. D Watkins 2016 Page 8

9 Probability 131) What is the probability of something impossible? 132) What is the probability of something certain? 133) How can you decide which probability is most likely? 134) How do you change a probability from a fraction to a decimal? Zero One Change all probabilities to a decimal and choose the largest one. Top number divided by bottom number. 135) What are the three steps involved in a Pythagoras question? 136) When do you choose to add in a Pythagoras question? Shape a) Square b) Add or take away c) Square root If the side you are finding is the longest one 137) When do you choose to take away in a Pythagoras question? 138) How do you calculate a gradient? If the side you are finding is a shorter one Vertical distance divided by horizontal distance 139) How many sides does a pentagon have? 5 140) How many sides does a hexagon have? 6 141) How many sides does an octagon have? 8 142) What is special about an equilateral triangle? 143) What is special about an isosceles triangle? 144) If you know the diameter of a circle, how do you find the radius? 145) If you know the radius of a circle, how do you find the diameter? All sides and angles are the same? Two sides and angles are the same Half it Double it D Watkins 2016 Page 9

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