KS2 Time Calculations

KS2 Time Calculations Ninja Maths

Key Stage 2 maths worksheets for time calculations from Ninja Maths. Time calculations play an important part of the curriculum for three important reasons.

Reason One – It’s Maths

Time calcs can start easy if you’re just adding say twenty three seconds to seventeen seconds. In that respect it’s just regular addition (and subtraction). Likewise, adding minutes to minutes so long as they total under sixty.

Reason Two – It’s Base 60

It begins to get more interesting when the total addition of several seconds is over sixty. To post adults it’s natural to know that seventy minutes is one hour and ten minutes. We often don’t realise we’re calculating 70 – 60 = 1hr, remainder 10 minutes, but that’s what we’re doing.

Reason Three – It’s Real World

Thirdly, the useful thing about learning time calcs is that it’s “real world”. Some pupils complain that they’ll never use algebra (even though they might), but no one can claim they’ll never need to run time calculations in their head.

Buy All Three Time Workpacks

KS2 Time Calculations Ninja Maths

Buy all three workpacks (ages 8-9, 9-10, and 10-11)

Content includes second, minute, and hour calcs, along with decoding questions, a relevant wordsearch and fun maze – all 24 pages for only £2.95

KS2 Time Calculations Ninja Maths KS2 Time Calculations Ninja Maths

Age 8-9 (England Year 4 / USA 3rd Grade) Time Calcs

In the Ninja Maths Year 4 Time Calcs workpack, it’s kept quite simple with only the last few questions needing to subtract sixty to work out a remainder.

Also in the workpack we meet Ninja Barry who’s waiting at the station to catch a train. The hour and minute calcs are relatively easy – for example, adding one hour to thirty minutes.

Age 9-10 (England Year 4 / USA 3rd Grade) Time Calcs

For this age-range the questions are a little trickier, with more questions requiring carrying seconds and minutes into hours.

Barry’s timetable is more complex, adding more difficult minutes and hours.

Age 10-11 (England Year 4 / USA 3rd Grade) Time Calcs

For this age-range the questions become even more difficult, requiring pupils to add longer periods of time, in 24-hr notation.

Ninja Barry Catches a Train

Train timetables are a great way to help teach time calcs as they’re relatable and real-world.

Everyday Time Calcs at Home

The next time you’re on a journey, ask your child at what time you’ll arrive, given how long it’ll take to get there. Similarly, if you’re on a multi-leg journey – e.g., walking to the station, then taking a ride, then walking at the other end.

To surreptitiously introduce time subtraction into any situation, ask how much time is left on a journey if you’ll arrive in twenty three minutes.

“But Daddy, you can’t divide five in half”

"But Daddy, you can't divide five in half" Ninja Maths

Today my daughter had an issue carrying five plates from the kitchen onto the dining table

There were five heavy plates in the kitchen and I asked my daughter to carry them onto the dining table. She said they were too heavy so I said to carry half then come back and carry the rest.

“But Daddy, you can’t divide five in half”.

Of course she was right. She couldn’t carry two and a half plates and then come back for the other two and a half.

Luckily she knew what I meant and after finding it really funny, then thinking about it a little longer, I decided I need a few more Ninja Master lessons in the practical application of mathematics in the real world and how language can sometimes be ambiguous, or at least reliant on the other person to “get what you mean” in exactly the same way that computers can’t.

Free Year 4 Time & Clock Calculation Worksheets

Free Year 4 Time & Clock Calculation Worksheets Ninja Maths

Seven new and free Time & Clock calculation worksheets for Years 4 and 5 which include time addition & subtraction as well as converting into 24hr notation

Year 4 Time & Clock Calculations: Free Worksheets

Year 4 Time & Clock Calculations – Worksheet 1, e.g. adding time to a digital clock

Year 4 Time & Clock Calculations – Worksheet 2, e.g. adding time to a digital clock

Year 4 Time & Clock Calculations – Worksheet 3, e.g. working out what time trains and planes arrive

Year 4 Time & Clock Calculations – Worksheet 4, e.g. working out what time trains and planes arrive

Year 4 Time & Clock Calculations – Worksheet 5, e.g. converting plain English times such as “A quarter to eight in the evening” into AM/PM

Year 4 Time & Clock Calculations – Worksheet 6, e.g. converting plain English times such as “A quarter to eight in the evening” into AM/PM

Year 4 Time & Clock Calculations – Worksheet 7, e.g. working out 24hr clock notation for morning and evening times

Why is Repetition with Variation so Important in Learning Maths?

Why is Repetition with Variation so Important in Learning Maths? Ninja Maths

Repetition with variation is very important to help a child secure numeracy in Primary School, here’s why…

Fluency & Numeracy

If you learn how to say “Hello, my name in the Ninja Master” in a foreign language and you say it once, that’s great. If a month later you need to say it, you would probably have forgotten it.

Repeating it with variation on a regular basis helps to not only understand what you’re saying, you will also perfect the accent and work out your own variations – for example “I am the Ninja Master, how are you?”

It’s the same with maths. Repeating how to add, subtract, multiply and divide fractions 300 times gives your child improves their fluency.

Confidence in Maths

The more a child practices how to work out perimeters and areas of irregular shapes the better they will become at is. When opening an exam paper and seeing a few questions about perimeter and area they will immediately feel confident about solving those questions.

Sense Checking their Own Answers in Maths

Practicing percentages for example over and over instills a sense of what is the correct answer. If a child knows how to work out 45% of 700 but has no sense of what the answer should be, they may get the answer wrong and not realise it.

Through repetition a child will sense that 45% of a number is just less than half, so if they’ve worked out that 45% of 700 is 610, they’ll immediately sense this is incorrect because half of 700 is 350. This enables a child to sense and fix their own mistakes.

Not having to waste time in Exams

During an exam a question may require a child works out a long division, e.g. 876 divided by 9. This may only be one step in a six-step question. The child should not spend lots of time trying to remember and work out how to do a long division. It should be automatic.

This is not about learning by rote, it is about making the most essential and necessary maths functions second nature.

I can do this all day…

The Ninja Master could talk about this for hours. If you’re interested in starting a discussion please contact me.

International Equivalence


English Year 4 for school ages 8-9 equates to:

USA Grade 3
Australia Year 3
Republic of Ireland Third Class
South Korea Grade 3
India Grade 3
Japan Grade 3
China Grade 3
Germany Grade 3
New Zealand Year 4
Wales Year 4
Netherlands Group 5
Scotland P5

English Year 5 for school ages 9-10 equates to:

USA Grade 4
Australia Year 4
Republic of Ireland Fourth Class
South Korea Grade 4
India Grade 4
Japan Grade 4
China Grade 4
Germany Grade 4
New Zealand Year 5
Wales Year 5
Netherlands Group 6
Scotland P6

English Year 6 for school ages 10-11 equates to:

USA Grade 5
Australia Year 5
Republic of Ireland Fifth Class
South Korea Grade 5
India Grade 5
Japan Grade 5
China Grade 5
Germany Grade 5
New Zealand Year 6
Wales Year 6
Netherlands Group 7
Scotland P7

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November Year 4 - Sample Pages


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November Year 5 - Sample Pages


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November Year 6 - Sample Pages


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