Equations

Vocab

100

What is an equation?

Mathematical statements that show the relationship between two sets of mathematical terms. We use the equals sign (=) when we write equations. The terms on the right-hand side have the same value as the terms on the left-hand side.

200

What is an unequal expression?

A mathematical statement that is not an equation, meaning the right-hand side and left-hand side do not have the same value. We use (>, <. =/)

300

What is a variable? Give an example

An alphabet or symbol that is used to represent a number. It is called a variable because it can take on any value.

Example: a, b, o

400

What are constants? Give an example

The numbers in mathematical expressions, which are added, subtracted, multiplied, and divided. They are called constants because they have a fixed value.

Example: 10, 609, 43

500

What is the symmetric property of subtraction? 

The symmetric property of subtraction states that we should subtract the same value from the right-hand side and left hand side of an equals sign to ensure the equation is correct. 

Writing Equations

100

There were p apples and 9 oranges in a basket. The total number of fruits in the basket was 13. How many apples were there in the basket?

p + 9 = 13

200

Ploy bought k packets of sweets. 12 packets of them were candies, and the remaining 18 packets of them were cookies. How many packets of sweets did Ploy buy in total?

k - 12 = 18

k - 18 = 12

300

There were 25 boxes of pencils on a shelf. There were g pencils in each box. The total number of pencils was 225. How many pencils were there in each box?

g x 25 = 225

400

Little had y cupcakes. She gave out the cupcakes equally to 23 students. Each student received 3 cupcakes. How many cupcakes did Little have?

y / 23 = 3

500

Fahsai distributed z stickers equally among her 14 friends. Each friend received 9 stickers. What was the total number of stickers did Fahsai have?

z / 14 = 9

Solving Equations

100

503,688 + p = 982,921

p = 479,233

200

q - 687,302 = 184,114

q = 503,188

300

103,467 - n = 97,864

o = 5,604

400

48,608 / o  = 784

o = 62

500

1,934 x p = 970,868

p = 502

Solving word problems

100

Teacher Megan had f marbles. Teacher Karina had 256 marbles. T Karina had 120 less marbles than T. Megan. how many marbles did T Megan have?

376 marbles

200

Jingjai distributed d sweets equally to 32 of her friends. Each friend received 9 sweets. How many sweets did Jingjai have in total?

288 sweets

300

Teacher Jacinta bought some greeting cards at the cost of 60 baht per card. She paid 720 baht in total for all the cards. How many greeting cards did Teacher Jacinta buy?

12 greeting cards

400

Sainum ate 678 cookies and Little ate h cookies. If Sainum ate 103 more cookies than Little, how many cookies did Little eat?

575 cookies

500

There were 8 times as many girls as boys at the BlackPink concert. If there were 71,696 girls at the concert, how many boys were there?

8,962 boys