Mass — South Australian Year 4 Maths
Solving problems with grams and kilograms, then reading thermometers and comparing temperatures in degrees Celsius. Two subtopics and 40 questions with answers, aligned to AC9M4M01.
Mass in South Australian Year 4
This topic is about measuring with scales and thermometers. Students solve mass problems with grams and kilograms, changing to the same unit before they add, subtract, multiply or share, and they read temperatures in degrees Celsius and compare them. Temperature sits in this topic because both skills come from the same Year 4 measurement content.
The two subtopics below are solving mass problems, and measuring and comparing temperature. Mass is one of the 20 topics in South Australian Year 4 Maths and sits in the Measurement strand. Both subtopics come under Australian Curriculum code AC9M4M01. Working with grams and kilograms prepares students for converting between other metric units in later years.
Subtopics
Mass: common questions
How many grams are in a kilogram?
There are 1000 grams in 1 kilogram. Half a kilogram is 500 g and a quarter of a kilogram is 250 g. To change kilograms to grams, multiply by 1000, so \(7\text{ kg} = 7000\text{ g}\). A mass such as 4200 g can also be written as 4 kg 200 g.
How do you solve a mass word problem?
First put every mass in the same unit, then decide whether to add, subtract, multiply or share. A box holding 1 kg 400 g of oranges with 550 g taken out has \(1400 - 550 = 850\) g left. Adding kilograms to grams without converting is the most common mistake.
How do you read a thermometer?
Find what each small step is worth by looking at two labelled numbers. If the labels go up in 10s and the gap between them is split into 5 equal steps, each step is 2 °C. So a red column that stops 4 steps above the 10 shows 18 °C.
How do you compare two temperatures?
The higher number is warmer. To find how much warmer, count on or subtract: from 9 °C at breakfast to 26 °C in the afternoon is a rise of 17 °C. At home, look at the weather forecast together and talk about which day will be warmest and by how much.
Which curriculum codes cover Mass in South Australian Year 4?
Both subtopics come under Australian Curriculum code AC9M4M01, the Year 4 content on reading scaled and digital instruments and using suitable units to measure and compare. In this topic it covers mass in grams and kilograms and temperature in degrees Celsius.