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A lesson to reinforce division and introduce decimal division

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1 A lesson to reinforce division and introduce decimal division
H S MIXED STARTER E Andy says “There is only one pair of prime numbers which add to give 16”. Show that Andy is wrong E Write the smallest prime number which is larger than the 5th multiple of 6 Find two cube numbers whose sum is a square number S S I am told to think of a number which is a multiple of 9, less than one hundred and a square number. How many different numbers could I be thinking about? P The mean weight of a group of 4 people is 70kg. A new person who weighs 85kg is added to the group. Find the new mean A lesson to reinforce division and introduce decimal division P In two classes of 20 students there are always less boys than girls and the amount of boys and girls are prime numbers. Both classes have a different mix of students What fraction of the combined classes are boys? LO: To perform decimal divisions

2 A lesson to reinforce division and introduce decimal division
Dividing decimals 27/12/2018 Core: will be able to use basic written methods to multiply numbers and decimals by the powers of 10. Challenge: will be able to divide an amount by a decimal. Aspire: to divide decimals by other decimals Vivo Star: Apply decimal division and understand its effect Keywords: base, place value, units and powers of 10 A lesson to reinforce division and introduce decimal division LO: To perform decimal divisions

3 A lesson to reinforce division and introduce decimal division
Bus stop division and place value M A T H S ACQUIRE FLUENCY (1) 0.9 x 10 (2) 0.5 x 10 (3) 0.3 x 10 (4) 0.15 x 10 (5) 4.3 x 10 (6) 1.7 x 100 (7) 3.4 x 100 (8) 6.21 x 100 (9) 4.1 x 100 (10) 5.8 x 100 (1) 240 ÷ 5 = (2) 360 ÷ 12 (3) 585 ÷ 15 (4) 864 ÷ 4 A lesson to reinforce division and introduce decimal division (1) 885 ÷ ? = 15 (2) 2024 ÷ = 44 (3) 5616 ÷ = 72 (4) 9409 ÷ = 97 LO: To perform decimal divisions

4 A lesson to reinforce division and introduce decimal division
Dividing Decimals M A T H S TALK ABOUT IT 200 ÷ 100 = 2 20 ÷ 10 = 2 2 ÷ 1 = 2 0.2 ÷ 0.1 = 2 What do you notice? A lesson to reinforce division and introduce decimal division Example question: 5.4 ÷ 0.06 LO: To perform decimal divisions

5 A lesson to reinforce division and introduce decimal division
Further Examples M A T H S HAVE A GO [IMC 1999 Q5] 30÷0.2 equals Calculate: a) 22.8÷0.5 b) 5.376÷0.06 c) ÷ d) ÷1.1 e) ÷0.11 A death laser can fire every seconds. How many times can it fire in 3 minutes? 1 4 A rectangle has area cm2 and height 1.3cm. What is its length? What is its perimeter? Calculate: a) ÷0.16 b) ÷1.5 c) 610.8÷0.12 2 A lesson to reinforce division and introduce decimal division 3 5 LO: To perform decimal divisions

6 A lesson to reinforce division and introduce decimal division
Further Examples M A T H S HAVE A GO [IMC 1999 Q5] 30÷0.2 equals Solution: 150 Calculate: a) 22.8÷0.5=𝟒𝟓.𝟔 b) 5.376÷0.06=𝟖𝟗.𝟔 c) ÷0.007=𝟒𝟎𝟑𝟔𝟎𝟎 d) ÷1.1=𝟗.𝟔𝟑 e) ÷0.11=𝟗.𝟎𝟗𝟏 A death laser can fire every seconds. How many times can it fire in 3 minutes? Solution: 45000 1 4 A rectangle has area cm2 and height 1.3cm. What is its length? 16.34cm What is its perimeter? 35.28cm Calculate: a) ÷0.16=𝟎.𝟑𝟖𝟏𝟓 b) ÷1.5=𝟗𝟗.𝟗 c) 610.8÷0.12=𝟓𝟎𝟗𝟎 2 A lesson to reinforce division and introduce decimal division 3 5 LO: To perform decimal divisions

7 A lesson to reinforce division and introduce decimal division
Exam Question M A T H S SUM IT UP A lesson to reinforce division and introduce decimal division Joanne is tiling her walls with a mosaic pattern. Each square is 0.04m x 0.04m The wall which Joanne wants to tile is 2.4m x 1.6m How many small squares will be needed to cover this wall? LO: To perform decimal divisions


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