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

## 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.