Chatelherault Primary School

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Presentation transcript:

Chatelherault Primary School Numeracy Across the Curriculum Chatelherault Primary School

Numeracy Working Party Chatelherault Primary

Numeracy Working Party Chatelherault Primary When adding/subtracting decimals, each decimal number should have the same amount of digits. This means filling in the blanks with zero’s.

Numeracy Working Party Decimal Multiplication STEP1: x by 10,100,1000 STEP2: x by 2,3,4,5 etc Examples: 1.12.7 x 30 2. 67.3 x 600 STEP 1: 12.7 x 10 = 127 67.3 x 100 = 6730 STEP 2: 127 x 3 = 127 6730 x 6 = 6730 x3 x6 381 40380 Chatelherault Primary Decimal Numbers Pupils are generally taught to move the decimal point to the right by 1,2 or 3 positions (x10, 100 or 1000). Note how a zero was added in Example 2 when multiplying by 100. 2 4 1

Numeracy Working Party Decimal Division (multiples of 10, 100, 1000). STEP1: ÷ by 10,100,1000 STEP2: ÷ by 2,3,4,5 etc Examples: 1.1687.5 ÷ 30 2. 421.5 ÷ 500 STEP 1: 1687.5 ÷ 10 = 168.75 421.5 ÷ 100 = 4.215 STEP 2: 168.75 ÷ 3 = 56.25 4.215 ÷ 5 = 0.843 The answers to STEP 2 were calculated using the technique illustrated in the previous slide. Chatelherault Primary Decimal Numbers Pupils are generally taught to move the decimal point to the left by 1,2 or 3 positions (÷10, 100 or 1000). A very common mistake is to divide by 10, 100, 1000 the multiply by 2, 3, 4 etc.

Numeracy Working Party Chatelherault Primary Percentages and their equivalent fractions must be memorised.

Numeracy Working Party Harder Percentages www.mathsrevision.com Calculator Method Non - e.g. 17.5% of 300 10% 300 ÷ 10 = £30 5% 30 ÷ 2 = £15 2.5% 15 ÷ 2 = £ 7.50 £52.50 17.5 % e.g. 19% of £60 19 ÷ 100x 60 = £11.40 Chatelherault Primary Alternative method for using a calculator would be 0.19 x 60 = £11.40

Numeracy Working Party Chatelherault Primary With decimal quantities the decimal point moves left or right respectively when ÷/× by 10, 100, 1000.

Numeracy Working Party Solving Equations Examples: 3x + 4 = 13 2. 5x – 3 = 3x + 7 3x = 13 – 4 5x – 3x = 7 + 3 3x = 9 2x = 10 x = 3 x = 5 Rule: Change side Change sign Chatelherault Primary There are other methods used to solve equations but this method is predominately used in the Maths Department.

Numeracy Working Party When working out time difference we will use the Counting On Method . This method will always work. Example : Find the time difference between 08 40 hrs and 11 10 hrs 08 40 11 00 11 10 Hrs Mins 20 2 10 30 nearest hour what’s left + 09 00 hours 20 mins 2 hrs 10 mins O riginal time Time Intervals www.mathsrevision.com Chatelherault Primary Another method would involve adding on whole hours i.e. 0840 to 1040 = 2 hours then 1040 to 1100 = 20 mins then 1100 to 1110 = 10 mins.

Numeracy Working Party Chatelherault Primary Alternative method for perimeter could be (2 x 6) + (2 x 3) = 18cm

Numeracy Working Party Chatelherault Primary

Numeracy Working Party Heilander’s Porridge Oats Volume = l x b x h 27cm Volume = 18 x 5 x 27 Volume = 2430 cm3 Chatelherault Primary Generally, we show three lines of working. Formula, working, answer with units. 5 cm 18 cm 1 Litre = 1000ml 1ml = 1cm3

Numeracy Working Party Chatelherault Primary

Numeracy Working Party Naming Angles Chatelherault Primary DÊF is an alternative notation for angle DEF.

Numeracy Working Party Horizontal Acute less than 90 o Obtuse Between 90 – 180 Right Angle exactly 90 reflex over 180 less than 360 Straight Line Angle Type of Angles Chatelherault Primary

Numeracy Working Party Finding Missing Angles 120 o 95 Angles round a point always add up to 360 65 Two angles making a straight line add up to 180 (Supplementary angles) Angles opposite each other at a cross are equal. 34 115 146 145 35 right angle add 90 (Complementary angles) 55 Chatelherault Primary

Numeracy Working Party Chatelherault Primary

Numeracy Working Party Bar Graph Favourite Pets Cat Dog Rabbit Hamster Snake 2 4 6 8 10 12 Number of Pupils Pets What labels should we use for the Bar Chart Title, Scale, Labels and Units where appropriate Chatelherault Primary

Numeracy Working Party Constructing a Line Graph A hospital nurse recorded a patient’s temperature every hour Temperature versus Time 97 98 99 100 101 102 103 Temp C 100.5 6:00 am 8:00 am 9:00 am 10:00 am 11:00 am 7:00 am Chatelherault Primary Line graphs are most often used to show trends over time. Temperature C Time Hours

Numeracy Working Party Revision is active NOT passive Success is 99% perspiration 1% inspiration Expect to get out what you put in . Study Skills For Success Practice makes perfect ! Practise the things you find difficult ! Chatelherault Primary