1.
/ A number in front of a variable (like the 3 in 3x).
2.
/ A letter that stands for a number we don’t know yet.
3.
/ A number that doesn’t change.
4.
/ The opposite operation (like adding is the opposite of subtracting).
5.
/ A math sentence with an equals sign (=) that shows two things are the same.
6.
/ A math phrase with numbers and letters, but no equals sign.
7.
/ A math sentence that uses <, >, ≤, or ≥ to compare two things.
8.
/ A problem you can solve in just one step.
9.
/ A problem that takes two steps to solve.
10.
/ A problem that takes more than two steps to solve.
11.
like terms / Put together terms that have the same variable (like 2x + 3x = 5x).
12.
property / Multiply a number outside parentheses with everything inside (like 3(x + 2) = 3x + 6).
13.
/ A part of an expression (like 5x or -2) separated by + or − signs.
14.
/ Flip the fraction! The reciprocal of 2/3 is 3/2.
15.
numbers / Counting numbers like 1, 2, 3, 4...
16.
numbers / Counting numbers and 0 (so 0, 1, 2, 3...).
17.
/ Whole numbers and their negatives (... -3, -2, -1, 0, 1, 2...).
18.
numbers / Numbers that can be written as fractions or decimals that end or repeat.
19.
numbers / Numbers that can’t be written as fractions and don’t end or repeat (like π or √2).
20.
decimal / A decimal that ends, like 0.5 or 2.75.
21.
decimal / A decimal that goes on forever with the same pattern, like 0.333...
22.
square / A number made by multiplying a whole number by itself (like 4 = 2×2, 9 = 3×3).
23.
square / A number that’s not a perfect square. Its square root is a decimal that doesn’t end nicely (like √2).
