Which is smaller, a temperature change from 66 degrees Celsius to 77 degrees Celsius or from 30 degrees Celsius to 60 degrees Celsius?
We have two different temperature changes: 66 degrees to 77 degrees and 30 degrees to 60 degrees. We want to know which change was smaller. To find that, we need to know the difference of each temperature changes. We find the difference in temperature with subtraction.
We would need to subtract 66 degrees Celsius from 77 degrees Celsius and then subtract 30 degrees Celsius from 60 degrees Celsius. On our first problem, in the units place, seven minus six equals one. And then the tens place, again seven minus six equals one. The change in temperature was 11 degrees.
Onto the second set, in the units place, zero minus zero equals zero. And the tens place, six minus three equals three. In the second set of temperatures, there was a change of 30 degrees. We need to know which of these is smaller.
A change of 11 degrees is less than a change of 30 degrees, and that means a change from 66 degrees Celsius to 77 degrees Celsius was smaller.