Video Transcript
What is the mass of the bread
roll?
In this question, we have to use
the balancing scales and the gram weights to find the mass of the bread roll. We can see that the scales are
balanced, which means that the mass is equal on each side. If we add together all of the gram
weights that we used to balance the scale, that will tell us the mass of the bread
roll.
The largest gram weight has the
number 50. This is worth 50 grams. There are two 10-gram weights and a
one-gram weight. Let’s add these gram weights
together. Let’s start by adding in the ones
column. Zero plus zero plus zero plus one
gives us a total of one. Next, we need to add in the tens
column. Five plus one plus one gives us a
total of seven. 50 plus 10 plus 10 plus one equals
71 grams. The mass of the bread roll is 71
grams.
