10. 3D Measurement

Lesson

When we are problem-solving, we might have to convert to the same units before we can solve. Let's try this problem to review.

Convert 946 grams to kilograms.

Worked Solution

Idea summary

Converting units of mass

When you convert from a larger unit to a smaller unit (e.g. \text{t} to \text{kg}), you multiply.

When you convert from a smaller unit to a larger unit (e.g.\text{g} to \text{kg}), you divide.

This video introduces the connections with decimals and fractions to the units of mass.

How many grams is 500 miligrams?

Worked Solution

Idea summary

If we have part of a unit, we can express that using fractions and decimals, but we can also express it with a different unit. Half a kilogram is the same as 500 grams.

This video looks at a story problem that involves adding and subtracting masses.

James buys a 4000 \text{ g} box of washing powder.

If he uses 2.3 \text{ kg} of the washing powder, how many grams of powder is left in the box?

Worked Solution

Idea summary

If we are solving problems, changing units can often help with solving.