Math Is Hiding in Your Day: Five P5 Questions

Five ordinary things pop onto a warm paper page, one after another: a running shoe, a durian, a backpack, a little triangle flag and a pencil box. "Maths is hiding in your day. Can you find it in five P5 questions?"

That is Math is hiding in your day, one of our Primary 5 Topic Explainers. Each object hides one Primary 5 question. The video gives your child time to pause and try each one before the answer and its working appear. Watch it together (it is under two minutes), then read on: every question is worked out in full below, along with a simple habit for finding math in your own family's day.

Math is hiding in your day: five everyday P5 questions to pause and try. Five cards. Ready when you are.

The method

The idea behind the video is simple: almost everything your child touches has a number on it. A distance, a weight, a price, a size. Spotting those numbers, and asking a question about them, is one of the easiest ways to keep math alive between practice sessions.

Every object in the video is turned into a question in three moves:

Find the number. The shoe has a distance in km. The durian has a weight in kg. The backpack has a price tag. The flag and the pencil box have lengths in cm.
Ask a question about it. How far altogether? How many grams? What is the sale price? What is the area? What is the volume?
Name the topic. Fractions, Decimals, Percentage, Area of Triangle, Volume. Naming the topic tells your child which method to reach for.

Once your child is used to those three moves, the questions start to come from them, not from you. That is the real goal.

Worked examples

All five questions are the ones in the video, with the same numbers. If your child has not tried them yet, cover the working first.

1. The running shoe (Fractions)

Ali jogs 2 3/4 km, then 1 1/2 km. What is the total distance?

Step 1: Make the fractions match. Quarters and halves are different sizes, so change the half into quarters: 1/2 = 2/4.

Step 2: Add the fractions. 3/4 + 2/4 = 5/4, which is 1 1/4.

Step 3: Add the whole numbers, then put it together. 2 + 1 = 3, and 3 + 1 1/4 = 4 1/4.

Ali jogs 4 1/4 km altogether.

2. The durian (Decimals)

A durian weighs 1.85 kg. How many grams is that?

Step 1: Recall the link. 1 kg = 1000 g.

Step 2: Multiply by 1000. 1.85 × 1000 = 1850. Each digit moves three places to the left.

The durian weighs 1850 g.

Check: 1 kg is 1000 g and 0.85 kg is 850 g, which makes 1850 g.

3. The backpack (Percentage)

A $40 backpack is 30% off. What is the sale price?

Step 1: Find 10%. 10% of $40 is $4.

Step 2: Find 30%. Three lots of 10%: 3 × $4 = $12. That is the discount.

Step 3: Take it away. $40 − $12 = $28.

The sale price is $28.

4. The triangle flag (Area of Triangle)

A triangle flag has a base of 14 cm and a height of 8 cm. What is its area?

Step 1: Take half of the base. ½ × 14 = 7.

Step 2: Multiply by the height. 7 × 8 = 56.

The area of the flag is 56 cm².

A triangle is half of a rectangle with the same base and height. The rectangle here would be 14 × 8 = 112 cm², and half of that is 56 cm².

5. The pencil box (Volume)

A pencil box is 20 cm by 5 cm by 3 cm. What is its volume?

Step 1: Find one layer. 20 × 5 = 100. One layer of centimetre cubes on the bottom of the box holds 100 cubes.

Step 2: Stack the layers. The box is 3 cm tall: 100 × 3 = 300.

The volume of the pencil box is 300 cm³.

Common mistakes

Adding fractions with different bottoms. 3/4 + 1/2 written as 4/6. Ask, "Are quarters and halves the same size?" Change them to the same size first.
Forgetting to carry the whole. Leaving the answer as 3 5/4. When the fraction is more than one whole, turn the extra quarters into a whole.
Multiplying by 100 instead of 1000. 1.85 kg is not 185 g. A quick sense check helps: a durian is heavier than a packet of sweets.
Stopping at the discount. $12 is how much is saved, not the price. Ask, "Is that what you pay?"
Forgetting the half for a triangle. 14 × 8 = 112 is the rectangle around the flag, not the flag.
Mixing up area and volume units. Area is in cm², because it covers a flat surface. Volume is in cm³, because it fills a space.

Parent tips

Play "spot the number". On the way to school, at the market or at dinner, take turns pointing at something with a number on it and asking a question. Your child's questions count just as much as yours.
Use real objects. Weigh the fruit, measure the pencil box, read the price tag. A question your child can hold in their hand is easier to start.
Ask "which topic?" Before your child works anything out, ask what kind of question it is. Naming the topic is half the work.
Keep it light. One or two everyday questions a day is plenty. If it starts to feel like homework, stop and pick it up tomorrow.
Let them check you. Make a deliberate mistake now and then and see whether your child spots it.

If your child is working through other Primary 5 topics, our guide to Primary 5 sample questions explained walks through more examples. For more on the volume and triangle questions above, our post on P5 volume, litres and triangle area has a fish tank full of them.

How Singapore Math Drills supports the habit

The video ends on the name of the feature it is modelled on, the Daily Five:

Daily Five drills: five hand-picked drill cards are waiting each day, so your child never has to decide what to practise.
Progressive hints and worked solutions: every question can be opened up step by step, and every question has a full worked solution to read afterwards.
Calm by design: no guilt-tripping over a missed day and no dark patterns, and progress is only ever measured against your child's own.

If you would like to know why a small daily set works so well, our post on why five a day works explains it.

Five cards. Ready when you are.

Try a sample

Try a free interactive Primary 5 worksheet and see how calm practice feels, with no signup or credit card required.

Try a free Singapore math sample