| Ratio and ProportionSparks 2. Using several measures, eg: in £, metres, kg, minutes
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Refine methods of multiplication and division
Use ratio and proportion to solve problems
Plan and carry out calculations using a calculator
Judge whether an answer is reasonable and check results using inverse operations or other methods
Ratio, proportion and notation 3:2, in addition to:
Numerator, denominator,
mixed number,
improper fraction,
unit fraction,
cancel, simplify,
equivalent, convert,
decimal fraction,
recurring decimal,
percentage.
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A problem requiring understanding of both ratio & proportion
Eg:
OHS N4/3: Shades of Grey
For ratio - use Q on sheet or similar;
For proportion, set Qs involving total quantities. Eg: 'They sell in tins of 240 ml. What proportion of Black & White is in each can? Gives answers as F (or D or %) ...
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EFFICIENT PROBLEM-SOLVING USING RATIO AND PROPORTION
Provide range of problem-solving opportunities involving both ratio and proportion, to include where suitable:,br>
Proportional division at appropriate point
Review and refine written methods of X and ÷
Plan efficient use of calculator
Judging whether results are reasonable
Use of inverse operation etc to check results
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Choose one example from each lesson to highlight at least 1 of these 5, eg: a proportional division problem;
OR
Whole class review of inverse operation using a number of examples (x10, +4 etc)
NNS P30a 233K download
Pp16-17 a 135K download. |
