Algebraic Expressions and Variables

Why are letters used in algebraic expressions?

• To make math problems harder

• To represent unknown quantities or values

• To replace numbers completely

• To write longer mathematical equations

What is a variable in mathematics?

• A number that never changes

• A quantity that is always constant

• A quantity that can change or be unknown

• A symbol used only in geometry

Encik Naufal donates the same amount of money every month. What type of variable is this amount?

• Fixed value variable

• Varied value variable

• Unknown quantity

• Profit-dependent variable

Miss Sofea's donation depends on the profit earned from her shop. What type of variable is her donation amount?

• Fixed value variable

• Varied value variable

• Constant quantity

• Known amount

Is the mass of each student in a class a fixed value or a varied value?

• Fixed value

• Varied value

• Constant value

• Always the same

A bag contains x blocks. If 4 blocks are taken out from the bag, what is the total number of blocks remaining?

• x + 4

• 4 - x

• x - 4

• 4x

Two bags each contain x blocks. Another bag contains y blocks, and 2 extra blocks are added. What is the total number of blocks?

• x + y + 2

• 2x + y + 2

• 2(x + y) + 2

• x + 2y + 2

What are expressions called when they are written in numbers and variables?

• Numerical expressions

• Algebraic expressions

• Variable expressions

• Mathematical equations

If p = 5 and q = 2, what is the value of 2p + q?

• 7

• 9

• 12

• 14

Encik Hafiz donates 8 bags of rice, each with a mass of x kg. Mr Li Cen donates 4 bags of rice, each with a mass of y kg. If x = 5 and y = 10, what is the total mass of rice donated in kg?

• 40 kg

• 60 kg

• 80 kg

• 120 kg