Four Gone





The four button has dropped off!

How can you do these calculations using this calculator?

Four Gone Calculations

A Mathematics Lesson Starter Of The Day

 


Topics: Starter | Arithmetic | Calculator | Mixed | Problem Solving

  • Lucianna Tebbs, Great Missenden C Of E School
  • Thursday, September 24, 2009
  • "Its really fun the first one was easy though."
  • Transum,
  • Monday, June 2, 2014
  • "Unusually working out the answer to the calculation in your head does not necessarily lead you to the correct method of doing the calculation on this strange calculator. The thinking has to be about an equivalent calculation that does not contain the number four.

    What a great way to practise mental arithmetic skills in a way that requires you to think about the meaning of the calculation and how the calculation can be adapted to produce the same result. This exercise could help uncover misconceptions and strengthen the mathematical understanding of your pupils."

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This starter has scored a mean of 3.1 out of 5 based on 79 votes.


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Answers

There are many different ways of performing the calculations with this broken calculator. Here are some examples.

1. 59994 + 8003 = 59995 + 8002

2. 559 - 254 = 558 - 253

3. 255 x 34 = 255 x 33 + 255

4. 25% of 540 = 50% of 270 = 270 / 2

5. 1/7  +  1/4 = 1 ÷ 7 + 0.25

6. 0.14 x 23.44 = 0.28 x 11.72

7. 2444 = 122 x 122 x 122 x 122 x 16


Laptops In Lessons

Teacher, do your students have access to computers?
Do they have Laptops in Lessons or iPads?

Whether your students each have a TabletPC, a Surface or a Mac, this activity lends itself to eLearning (Engaged Learning).

Laptops In Lessons

Here is the URL for a concise version of this page without comments or answers.

Transum.org/go/?Start=June2

Here is the URL which will take them to a related student activity.

Transum.org/go/?to=Six

 

 




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