What is the most common decimal slip?

Not lining up the decimal points, so tenths and hundredths get added directly; pad with zeros first.

How many decimal places does a product have?

Add the decimal places in the two factors and give the product that many places, then drop trailing zeros.

A zero does not change the value, but it lines up the place values and avoids borrowing errors.

P4 Maths Four Operations with Decimals Paper 1: Basics

2026-11-09

Tutor Prep Guide · P4 Maths

Ten original items, each with an answer and a one-line explanation.

Direct answers　Items 1-3 are basic, 4-6 intermediate and 7-9 challenge, with item 10 as the error review. Time yourself first, then check each answer and redo what is wrong.

01　Paper details (check answers afterwards)

Item	Detail
Questions	10
Suggested time	15
Difficulty mix	Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1
Chapter	Chapter: P4 Maths: Four Operations with Decimals
Level	P4

02　Questions (10 items)

FoundationWhat is 3.6 plus 2.45?
FoundationWhat is 9.2 minus 4.75?
FoundationWhat is 0.6 times 7?
IntermediateWhat is 8.4 divided by 4?
IntermediateWhat is 12.5 plus 3.75 minus 4.2?
IntermediateThree identical pens cost $7.35 in total. What is the price of one pen?
ChallengeEach bottle holds 1.25 L of water. How many litres are there in 4 bottles?
ChallengeWhat is 2.5 times 0.4?
ChallengeA pencil costs $0.85. How much do 6 pencils cost?
Error redoError review: a student worked out 1.2 + 3 as 1.5. What is the correct answer?

03　Answers and one-line notes

#	Answer	One-line note
1	6.05	Line up the decimal points first: 3.60 plus 2.45 = 6.05.
2	4.45	Write 9.2 as 9.20, then 9.20 minus 4.75 = 4.45.
3	4.2	Work out 6 times 7 = 42, then put back one decimal place: 4.2.
4	2.1	8.4 is 84 tenths, and 84 divided by 4 = 21 tenths, which is 2.1.
5	12.05	Add first: 12.50 plus 3.75 = 16.25, then subtract 4.20 to get 12.05.
6	$2.45	Divide the total by the number of pens: 7.35 divided by 3 = 2.45.
7	5 L	1.25 times 4 = 5, so four bottles hold 5 L in total.
8	1	25 times 4 = 100, and the two factors carry two decimal places, so the product is 1.00, that is 1.
9	$5.1	0.85 times 6 = 5.1, and money is written to two decimal places.
10	4.2	Treat 3 as 3.0, so 1.2 plus 3.0 = 4.2; adding without lining up the decimal points gives 1.5.

04　What to do after marking

After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
Repeat the same item two days later; move to the next paper only when both attempts are correct.
Parents only need the answer and note columns; there is no need to explain every item.

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