Adding Fractions
Part 1 - what is the sign of the sum of 2 negative numbers? Part 2 - what is the sign of the sum of 2 positive numbers?
Part 1 - negative
Part 2 - positive
Double Jeopardy!!!! How can you know what sign will be for the sum of a negative and a positive number?
The answer will have the same sign as the number with the greatest absolute value.
Give one of the 2 phrases or names we use in math to remind us how to change a subtraction sentence into an addition sentence.
What is Add the Opposite or Keep, Change, Opposite
14 1/7 - ( -3 3/14)
17 5/14
117.4 + 8.93
126.33
In her garden Pam plants the seed 4 1/2 in. below the ground. After one month the tomato plant has grown a total of 9 3/4 in. How many inches is the plant above the ground?
What is 5 1/4
Decide if each expression describes a difference that is positive, negative, or zero.
3.7 −9 9/10
3.7−(−9 9/10)
Negative; Positive
Suppose a deep sea diver dives from the surface to 83.5 feet below the surface. He then dives down 11.2 more feet. The diver's depth is represented by the sum −83.5+(−11.2). Find and interpret the sum to describe the diver's present depth.
-94.7
94.7 feet below the surface
The freezing point of Chemical A is −127.27°C. The freezing point of Chemical B is −89.1°C. Which chemical has a higher freezing point? How much higher is it?
Chemical B has a higher freezing point by 38.17 degrees