Mirror Maths

Topics: Starter | Arithmetic | Puzzles | Symmetry | Transformations

• Aimee Hamilton, Harrytown Catholic High School
• Thursday, March 08, 2007
• "80+101=181"
• Abigail Latham, Swinton
• Saturday, March 10, 2007
• "Hello.
  Im Abigail Latham From St. Charles Rc Primary School Swinton Manchester
  And I Found That 300+100+300+300=1000
  30+30+30+10=100
  10x10=100"
• Abz :D, St Charles Rc Primary
• Wednesday, March 14, 2007
• "100+300+300+300=800
  800x10=8000
  0x10=0
  300.08x10=3000.8
  =]:D"
• Alice K, St Matts
• Wednesday, March 10, 2010
• "100 + 88 +111 +1 = 300."
• Primary 7, Bargeddie Primary School
• Wednesday, March 10, 2010
• "We enjoyed this starter, especially since one of our groups are studying symmetry...
  Here are some of our examples:
  333 - 333 + 1 = 1
  33 x 3 + 1 = 100
  11 x 3 = 33
  111 - 111 + 8 = 8
  Callum in our class also noticed that multiplying any combination of multiples of 10 would give a symmetrical answer:
  e.g. 1000 x 1000, 1 000 000 000 x 1000, 10 x 100 000 000 000 etc."

 

• Mr. T, Gartree High School
• Wednesday, March 10, 2010
• "Good for younger groups like year 7s since the sums are pretty straight forward but they liked trying to work out how to reflect the digits."
• Tomiloba Awosika, Bishop Challoner School
• Thursday, March 10, 2011
• "Tomiloba from Bishop Challoner School 8B3 has come up with an example - 300 + 300 + 300 - 100 = 800."
• Prendergast, Prendergast 9.1 Maths
• Thursday, March 10, 2011
• "11 + 11 + 11 = 33
  11 + 11 + 38 + 10 + 10 = 80
  8 x 1 = 8
  11 x 3 = 33
  11 x 8 = 88
  13 + 18 = 31
  3 x 1 = 3
  1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 = 8
  1 + 1 + 1 = 3
  symmtrical number x 0 = 0."

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.
Click here to enter your comments.

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:

This starter has scored a mean of 3.6 out of 5 based on 75 votes.

Previous Day | This starter is for 10 March | Next Day