15 x 1 = 28 978 x 6 = 6636 50 x 77 = 10660 1 x 44 = 3444 99 x 97 = 46563 97 x 39 = 41733

Each red box represents a missing digit.
Can you find out what they are?

Missing Digits Starter Of The Day

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Topics: Starter | Arithmetic | Problem Solving

• Miriam Candelaria, Toa Baja, Puerto Rico
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• It is fun and a great day starter. I would really appreciate the answer key, though.
• Transum,
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• Thanks Miriam, you'll find the answers to most starters right at the bottom of the page for those who have a Transum subscription.
• Helsby High School, 10y4
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• Most of the class thought this was a good starter. Thank You
• Mrs O'hagan's 3rd Yr Class, Holyrood Sec School Glasgow
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• We enjoyed the activity and would like similar but even more challenging!
• 6LC, West Kidlington Primary School
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• It was quite hard but we really enjoyed it!
• Transum,
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• What strategies might you use to do this activity? Most people would probably reach for their calculator straight away but the task requires a more thoughtful approach. Each calculation has a different form and different suppositions can be made depending on the digits that are given. Trial and improvement with a planned range of possible missing digits and a calculator used wisely will help solve this puzzle. Each time the page is refreshed a different set of calculations will appear giving plenty of opportunity for practice.

How did you use this starter? Can you suggest how teachers could present or develop this resource? Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for Maths teachers anywhere in the world.

If you don't have the time to provide feedback we'd really appreciate it if you could give this page a score! We are constantly improving and adding to these starters so it would be really helpful to know which ones are most useful. Simply click on a button below:

Excellent, I would like to see more like this
Good, achieved the results I required
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Didn't really capture the interest of the students
Not for me! I wouldn't use this type of activity.

This starter has scored a mean of 3.1 out of 5 based on 421 votes.

Previous Day | This starter is for 1 December | Next Day

 15 x 19 = 285 978 x 62 = 60636 580 x 177 = 102660 81 x 424 = 34344 499 x 937 = 467563 947 x 439 = 415733

Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers.

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 Teacher, do your students have access to computers?Do they have iPads or Laptops in Lessons? Whether your students each have a TabletPC, a Surface or a Mac, this activity lends itself to eLearning (Engaged Learning).

Transum.org/go/?Start=December1

The 1st December is the date to start opening the doors of the 2020 Mathematics Advent Calendar.