Vocabulary
What is an equation?
A mathematical sentence that says two things are equal.
x + 3 = 5
x= 2
x + 4 + 6 = 25
x= 15
Tell me the fact families for these numbers: 1, 2, 3
1 + 2 = 3
2 + 1 = 3
3 - 1 = 2
3 - 2 = 1
If you have $20 and you spend $11, what will your change be?
$9
What is a variable?
A symbol or letter that stands for an unknown number.
y + 10 = 20
y = 10
y - 42 = 12
y = 54
Tell me the fact families for these numbers: 2, 2, 4
2 + 2 = 4
4 - 2 = 2
If a ticket to the movies costs $8, how many tickets did I buy if I spent $24?
3
What is a fact family?
A group of math equations using the same set of numbers.
20 - a = 15
a = 5
22w = 110
w = 5
Tell me the fact families for these numbers: 20, 30, 50
20 + 30 = 50
30 + 20 = 50
50 - 20 = 30
50 - 30 = 20
If I buy two cakes, and they were $6 each, how much money did I spend?
$12
What is another word for evaluate?
solve
2x = 4
x = 2
2x + 4 = 24
x = 10
Tell me the fact families for these numbers: 3, 4, 12
3 x 4 = 12
4 x 3 = 12
12 divided by 4 = 3
12 divided by 3 = 4
Lianne ran 14 miles last week, and Keion ran x miles last week. They ran a total of 50 miles. How many miles did Keion run?
36 miles
What is Algebra?
A type of math that uses numbers
3t = 9
t = 3
14t = 126
t = 9
Tell me the fact families for these numbers: 5, 9, 45
5 x 9 = 45
9 x 5 = 45
45 divided by 9 = 5
45 divided by 5 = 9
Kanye spent $16 at the food court. Ajay spent y dollars at the food court. They spent a total of $27. How much money did Ajay spend.
$11