Grade Six Mathematics
Excellent work, boys and girls!
Answers to last week’s exercise
Exercise 1 a) 25000m b) 35342m c) 171000m d) 97000m e) 90900m f) 313000m g) 614030m h) 90000m i) 75300m j) 78900m
Hello Boys and Girls,
I trust that your week at school was pleasant. Last week, we delved into the topic of measurement, specifically converting length units. This week, our exploration of measurement continues, with a shift in emphasis towards units of mass. Work, carefully.
Measurement Mass
Exercise 2 a) 5.6km i) 86.3km
What is mass? Mass refers to the quantity of matter present in an object. The weight of the object is determined by both its mass and the gravitational force exerted on it.
Common units of mass
The table provided illustrates of the everyday metric units of weight along with their corresponding symbols.
Carefully examine the chart provided, above.
In the metric units of mass chart shown, the size or value of the units decreases from left to right.
That is: Kg > hg > dag > g > dg > cg > mg. Generally, the value of each unit is 10 times the unit to its immediate right and of the unit to its immediate left.
For example:
Examine the decigram column, what is the unit to its immediate right? The centigram is the unit immediately to the right of the decigram. Therefore; one decigram is ten times a centigram.
Ok pupils, let’s assess what you’ve understood up to this point!
Exercise 1
Converting from one mass unit to another
Complete the following table using the metric units of mass chart.
When converting a larger unit to a smaller unit, we multiply.
Converting grams to milligrams
Formula: 1 g = 1000 mg
Example 1: Convert 5g to mg.
Since 1000mg = 1g, we multiply by 1000
Hence: 5 x 1000= 5000 mg
Example 2: Convert 9.4g to mg.
Since we are multiplying a decimal by 1000, and a thousand contains three zeros, we shift the decimal point three places to the right.
9.4x 1000 = 9400mg
It’s that simple!
Exercise 2
Convert the following to milligrams. a) 12 g _____ mg b) 20g ______mg c) 8.3 g ____mg d) 9.51g ______mg e) 2.9 g ____ mg f) g) 5.53g ______mg 77.4g ______mg h) 10g ________mg i) Sarah has 18g of flour. How much mg can she get from 3g? j) 45g of sugar is equal to how much mg?
I hope you enjoyed working on those!
Let’s move on!
Converting kilograms to grams Formula: 1 kilogram= 1000 grams
Example 1
Convert 9kg to grams.
Since 1kg= 1000g, we multiply 9 by 1000 Hence: 9 x 1000= 9000g