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The bottom half of some symmetrical calculations are shown above. Can you work out the answers?
Can you make up some other calculations where the calculation and the answer both have horizontal lines of symmetry?

## A Mathematics Lesson Starter Of The Day

• Aimee Hamilton, Harrytown Catholic High School
•
• 80+101=181
• Abigail Latham, Swinton
•
• 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
•
• -100+300+300+300=800
800x10=8000
0x10=0
300.08x10=3000.8
=]:D
• Alice K, St Matts
•
• 100 + 88 +111 +1 = 300.
• Primary 7, Bargeddie Primary School
•
• 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
•
• 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
•
• Tomiloba from Bishop Challoner School 8B3 has come up with an example - 300 + 300 + 300 - 100 = 800.
• Prendergast, Prendergast 9.1 Maths
•
• 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.
• Elliot, 7X3WO
•
• 10+0=10.
• Octavia Pullman, London School Of Rock, London
•
• 30+8= 38.

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.

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

 l l + 38 = 49 88 x 33 = 2904 838 - 383 = 455 l 8 l x l l = 1991 3 l + 3 l + 3 l = 93 l 0 x l 0 l + l l l = 1121 l 8 l x l 3 l - 80 = 23631 l 380 + 38 - 83 = 1335

 Your next challenge is to make an equation with a horizontal and a vertical line of symmetry or a mathematical ambigram Ambigrams were made famous in Dan Brown's novel "Angels and Demons"

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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=March10

Here is the URL which will take them to an activity about rotational symmetry.

Transum.org/go/?to=rotate

For Students:

For All: