Strategies for basic addition and subtraction facts
In this video I show several strategies for learning the basic addition and subtraction facts:
- finding all the possible sums for a certain number; e.g. for 6, these would be 0 + 6, 1 + 5, 2 + 4, and 3 + 3;
- writing out all the fact families where the sum is a certain number;
- the 9 "trick"; 9 + 7 is the same as 10 + 6 (9 wants so badly to be 10 so that it "steals" one from 7);
- doubles and the accompanying addition facts;
- number rainbows and how to use them to practice subtraction;
- a structured drill for addition facts.
Enjoy!
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Addition (often signified by the plus symbol "+") is one of the four elementary, mathematical operations of arithmetic; with the others being subtraction,multiplication and division. The addition of two whole numbers is the total amount of those quantities combined. For example, in the picture on the right, there is a combination of three apples and two apples together; making a total of 5 apples. This observation is equivalent to the mathematical expression"3 + 2 = 5" i.e. "3 add 2 is equal to 5"
- finding all the possible sums for a certain number; e.g. for 6, these would be 0 + 6, 1 + 5, 2 + 4, and 3 + 3;
- writing out all the fact families where the sum is a certain number;
- the 9 "trick"; 9 + 7 is the same as 10 + 6 (9 wants so badly to be 10 so that it "steals" one from 7);
- doubles and the accompanying addition facts;
- number rainbows and how to use them to practice subtraction;
- a structured drill for addition facts.
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