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|| PRE-ALGEBRA ||
|| ADDITION AND SUBTRACTION IN EQUATIONS ||
FOR AGES 10 AND 11
POINTS TO REMEMBER :
* In an equation, changing the order of the numbers you are adding doesn't change their sum.
For Example:
a + (b + c) = (a + b) + c = (b + c) + a = a + c + b.
** Any number plus 0 (zero) equals itself.
For Example:
a + 0 = a.
*** If two sides of an equation are equal, you can-
1. add the same amount to both sides, or
2. you can subtract the same from both sides,
and they will still be equal.
For Example:
a = b
a + c = b + c
a - c = b - c.
Exercise:
Problem
x + 35 = 153
Solution:
x + 35 = 153
x + 35 - 35 = 153 - 35 = 118
x = 118
Problem
b - 62 = 216
Solution:
b - 62 = 216
b - 62 + 62 = 216 + 62 = 278
b = 278
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