# Unit Conversion using Algebraic Substitution

**Posted:**February 4, 2013

**Filed under:**Application of Skills, Measurement, Measurement, MTH145, MTH148, MTH173 |

**Tags:**algebra, Algebraic Substitution, conversion, Unit Conversions Leave a comment

It was great that my Chair, Iain McNab, was able to join us for our screencasting day. This is a great example of how different approaches may make more sense to different students, depending on their thinking.

Advertisements

# Direct Variation – both methods

**Posted:**January 29, 2013

**Filed under:**Application of Skills, MTH145, MTH148, MTH173, Ratio & Proportion, Ratio & Proportion |

**Tags:**direct, mathcast, variation Leave a comment

Given y is directly proportional to x and y46 when x62, find y when x17.

# Proportions – Solving for the variable

**Posted:**January 29, 2013

**Filed under:**Application of Skills, MTH145, MTH148, MTH173, Ratio & Proportion, Ratio & Proportion |

**Tags:**cross-multiplication, mathcast, proportions, variable Leave a comment

Student solution for solving for x in a proportion by cross-multiplication.

Advertisements

# Solving for x in a proportion

**Posted:**January 29, 2013

**Filed under:**Application of Skills, MTH145, MTH148, MTH173, Ratio & Proportion, Ratio & Proportion |

**Tags:**mathcast Leave a comment

Solving for x in a proportion

Advertisements

# Unit conversion – seconds to days

**Posted:**January 29, 2013

**Filed under:**Application of Skills, Measurement, Measurement, MTH145, MTH148, MTH173 |

**Tags:**days, mathcast, seconds, unit conversion Leave a comment

Student solved problem where seconds are converted to days.

Advertisements

# Indirect Variation – both methods

**Posted:**January 29, 2013

**Filed under:**Application of Skills, MTH145, MTH148, MTH173, Ratio & Proportion, Ratio & Proportion |

**Tags:**indirect variation, mathcast Leave a comment

Given y is indirectly proportional to x and y95 when x54, find y when x17.

Advertisements