MEASUREMENT – T

OP 5

MA

SS

MEASUREMENT – MASSTOP 5

1.I can convert between units as appropriate.

2.I know the relationship between units of measurement.

3.I know which units are suitable for measuring in different contexts.

4.I can explain how the metric system relates to our Base 10 number system.

5.I can use my understanding of measurements to solve problems.

MENTAL ROUTINE

Closed questions:• State what unit of

mass you think would be sensible to use when measuring the mass of the following

objects:•A cow•An elephant•A pair of scissors•A drawing pin•A truck•A fridge•A tablet (medicine)

MENTAL ROUTINE

If 1 kg equals 1 000g how many grams in:

• Half a kilogram

MENTAL ROUTINE

If 1 kg equals 1 000g how many grams in:

• A quarter of a kilogram

If 1 kg equals 1 000g how many kilograms in:

• 2 000g• 5 000g

MENTAL ROUTINE

How much would a bag weigh if it contained 200g of jam and 900g of oranges?

MENTAL ROUTINE

How much would a bag weigh if it contained:

• 1.5 kg of potatoes and 4L of milk?

MENTAL ROUTINE

Open Questions: (more than one correct answer)

• How much would your drink bottle weigh if it was full?

MENTAL ROUTINE

• If I weigh 60kg, what would physiotherapists recommend in terms of weight for my backpack? (Not more than 10% of my weight)

MENTAL ROUTINE

• What could I put in my backpack so that I don’t strain my back too much? Show the items, weights and totals.

MENTAL ROUTINE

Flip Question:

Guess the mass I have in my mind.

Use a range of language to ask yes and no questions.

Fractions

Greater than

Less than

Items that could be measured in the unit

MASS AND THE BASE TEN SYSTEM

. Th H T O Tths Hths Thths 10Thths

100Thths

Mths

kg g mg

t kg g mg

1 kg = 1 000 g1 g = 1 000 mg1 t = 1 000 kg

.

USE RELATIONSHIPS TO FIND:

• A van can carry a maximum weight of 700 kg. Write this mass in tonnes.

• Find how many milligrams are in:•20g•2g•0.2g

PROBLEMS TO SOLVE:

• How many 20 gram chocolates would there be in a box with a mass of 240 g?

PROBLEMS TO SOLVE:

• A packet contains 10 tablets, each weighing 500mg. Find the total mass of the tablets, in grams.

PROBLEMS TO SOLVE:

• Sliced ham cost $9.80 per kilogram. How much does it cost to buy 300 grams?

PROBLEMS TO SOLVE:

• A large sheet of paper weighs 80 g. Find the mass of 1 000 sheets. Answer in kilograms

PROBLEMS TO SOLVE:

• Jane and Toby are moving house. They have packed their household items into boxes. There are 53 boxes and they guess the boxes have an average mass of 12 kg. What mass are they moving? Is it more or less than half a tonne?

PROBLEMS TO SOLVE:

• Harry bought these items at the supermarket: 350 g of bacon, 500 g of sausage, 340 g of cheese and 110 g of olives. Find the total mass of his purchases.

REFLECTIVE QUESTIONS:

• Which strategies were helpful?• What was tricky/ challenging?• What helped you to solve

problems?• Which was more efficient (brain

saving)?• What will you try next time?