Question about The Learning Company Achieve! Math & Science Grades 1-3 (381933) for PC, Mac

# What is the difference between 8 and -9 - The Learning Company Achieve! Math & Science Grades 1-3 (381933) for PC, Mac

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• The Learning... Master

Hello,
8-(-9)=8+9= 17.

Suppose you have a temperature of -9 degrees outside and 8 (in fact +8) degrees in you home. What is the difference of temperature between the inside and the outside.
Starting from the -9 deg mark, you move up the scale counting the number of degree marks until you reach +8 degrees.
Each time you see a degree mark you add one
-9 Does not count, it is the starting point.
-8 Count 1
-7 2
-6 3
-5 4
-4 5
-3 6
-2 7
-1 8
0 9
+1 10
+2 11
..

+8 17

Hope it helps.
-

Posted on Sep 15, 2009

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Posted on Jan 02, 2017

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