Calculating Cement Mixture Ratios

Competency C: Understand and Use Numbers
Task Group C3: Use measures
Level: 2
At this level, learners: Use measures to make one-step calculations

Performance Descriptors
The learner:

• Calculates using numbers expressed as whole numbers, fractions, decimals, percentages, and integers
• Calculates angles in simple, common shapes
• Makes estimates
• Understands and uses ratio and proportion
• Interprets and represents area and volume using symbols and abbreviations (e.g. m3 )
• Interprets and applies rates (e.g. km/hr, km/l) and ratios (e.g. map scales)
• Converts units of measurement within the same system and between systems
• Understands and uses formulas for finding the perimeter, area, and volume of simple, common shapes
• Chooses and performs required operation(s); may make inferences to identify required operation(s)
• Selects appropriate steps to solutions
• Interprets, represents, and converts measures using whole numbers, decimals, percentages, ratios, and simple, common fractions (e.g. ½, ¼)
• Uses strategies to check accuracy (e.g. estimating, using a calculator, repeating a calculation, using the reverse operation)

Task Descriptors

• Scope of task is clearly defined
• May include unfamiliar elements (e.g. context, content)
• Requires the use of rates or common formulas
• Requires one-step calculations, which may be repeated; operations are easily inferred
• May be completed in more than one way
• May involve one document, such as a simple conversion table
• May require converting between whole numbers, decimals, fractions, ratios, and percentages

ESKARGO:
Embedded Skills, Knowledge and Attitudes Reference Guide for Ontario – C3.2