10.08 Order and compare mass

73, \, 33, \, 37

We should order the tens first, then the ones.

The numbers in the place value table are shown:

37 and 33 have the same smallest tens digit, so they are smaller than 73.

But 33 has the smaller ones digit, so 33 is smaller than 37.

The numbers from largest to smallest are: 73,\,37,\, 33

671, \, 167, \, 617

We should order the hundreds first, then the tens, then the ones.

The numbers in the place value table are shown:

167 has the smallest hundreds digit so it is the smallest number.

671 and 617 have equal hundreds digits, but 617 has the smaller tens digit.

The numbers from largest to smallest are: 671,\,617,\, 167

Which of these animals is the heaviest?

The heaviest animal will be the one with the largest number on the scales. Plot the weights of the animals on a number line.

The three weights are plotted on a number line below.

Based on the number line, the number line shows that the cockatoo is the heaviest among the three. So the correct answer is option B.

Which of these animals is the second lightest?

The second lightest animal will be the one with the second smallest number on the scales.

Based on part (a), the number line shows that the pigeon is the second lightest animal. So the correct answer is option C.

Which of these animals is the lightest?

The lightest animal will be the one with the smallest number on the scales.

Based on part (a), the sparrow is the lightest among the three. So the correct answer is option A.