Every year in our homeschool community, our students review the four basic laws in math. They learn additional formulas and measurement details, but the four basic laws seemed to stump our family the first few years. This past year, I finally thought through the laws and what the words mean in order to create the memory peg for my children.
Here is what I say!
(a + b) + c = a + (b + c)
(a x b) x c = a x (b x c)
Who “associates” with whom? In the first section, a associates with b, but on the other side b associates with c. This shows you where the parenthesis need to go. You “associate” with the letter inside the parenthesis with you!
a + b = b + a
a x b = b x a
This law is simple. My husband works from home in an office upstairs. In the morning, he leaves the bedroom (a) and “commutes” to his office upstairs (b). In the evening, he leaves his office upstairs (b) and heads back to our room (a). The commute is the same, but the starting and ending points switch/reverse in order. This would work for any commute. It just needs to be simplified to 1 starting point and 1 ending point.
a(b + c) = a x b + a x c
This one is the hardest to explain. What I tell my children is that the a is “distributed” out to the b and to the c. In the first part, the b and the c work together and then get the a involved. In the second part, the a is “distributed” to each of letter individually, and then they are added together.
a x 1 = a
a + 0 = a
This law really is simple without an explanation. The one thing I do throw out is this question – in each situation, what does a have to do to remain a (or to keep its identity)?
Another fun thing to do with the math laws is actually try them out! I love to sit down with my students at home and plug in a number for each letter. Then they are able to see the truth behind the laws.
Note: I would never explain this in detail in our homeschool community classes as we introduce the memory work, but do not teach about it at the younger ages. It’s a fun and simple way to discuss the laws at home while you memorize them!
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