What if the options followed the rule that the pair should have the same sum of the digits, even if it is different than 30? There's more understanding, less pain, and everyone wins.
The sum of all digits is 30 in both the numbers. During an independent reading lesson, the teacher provides minimal support to readers: hence, students read independently.
I purposefully used a different interpretation of what "negative" means: it's a different counting system, just like Roman numerals and decimals are different counting systems.
Me: Get out. Look for strange relationships. Realize you can learn. Me: Sure they do. Algebra - Introducing Simple Equations See also: Set Theory Many people think that equations and algebra are beyond them - the thought of having to work with equations fills them with fear.
Letters are used to replace some of the numbers where a numerical expression would be too complicated, or where you want to generalise rather than use specific numbers.
Determine if a Relation is a Function This video explains the concepts behind mapping a relation and the vertical line test.