Math Revision

Find the correct algebraic expression : Subtract k from 21

• k - 21

• 21 - k

• (k -21)

• (21 - k)

Find the correct algebraic expression: Multiply A by 36

• A36

• a36

• 36A

• 36a

Find the correct algebraic expression: Divide 8 by d

• 8d

Ada has U dollars and she buys a robot. She got (a)   dollars after she bought the robot.

Mr Chan bought h remote control cars. He had to pay (a)   dollars in total

Toy guitar is E dollars more expensive than a plane model.

A toy guitar costs (a)   dollars.

Answer explanation

Milly's weight is part of Ken's weight so we need multiplication.

Answer explanation

Answer explanation

We consider "all primary5 students" as "1". We need to find the fraction of students do not join any of the activities.

Therefore should be "1" minus all fractions of the 2 activities.

Answer explanation

We have to find out the difference of hours she spend on sleeping and listening to music.

Also the number of hours Mum spent on watching TV is more than listening to music.