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Objective:
Using formulae to add and subtract numbers that we are not familiar with.Help on this Topic:
Adding and subtracting Integers part 1
Moscow is 7 degrees hotter than Leningrad.
If Leningrad is 4 degrees, what temperature is Moscow?
(#Leningrad) + (#hotter Moscow is)
(#Leningrad) + (#hotter Moscow is ) is our formula!
It means Add the two values we have together.
When adding a whole number to an integer think of the integer as the total number of people who have got on a bus (if the number is positive) or the total number of people that have got off the bus (if the number is negative). Now add a whole number of people to this value.
E.g. +10 + 7 = +17
-3 + 7 means that more people get on the bus (+7) than have got off the bus (3) so overall +4 people have got on the bus.
-10 + 7 means that more people had got off the bus (10) than got on the bus (+7) so overall 3 people have got off the bus, so the answer is -3