students struggling with times tables? develop mental strategies
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© Classroom Professor, 2013
Subtraction
• How many times can you subtract 7 from 83, and what is left afterwards? • You can subtract it as many
times as you want, and it leaves 76 every time.
• (The Quote Garden)
the Key to FluencyDr Peter PriceClassroom ProfessorQUEDREX 2013
Students Struggling with Number Facts? Develop Mental Strategies,
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WHY MEMORISE NUMBER FACTS?
3
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Basic facts are part of the foundation needed for algebra, geometry, measurement, probability and statistics
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Using a calculator for basic facts is slower than recalling them
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NAPLAN!
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NAPLAN & number facts
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Human students can think; they are not robots
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Knowing basic facts allows you to answer lots of operations questions without an algorithm
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Allows students to tackle real maths - shopping, helping in the shed, sports, ...
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Knowing one number fact tells you families of other facts
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We will need the next generation to solve the world’s problems
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THE MENTAL STRATEGIES APPROACH
13
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What are we aiming for?
• We want students to understand what they are doing.
• Rote learning is based on repetition, and cannot lead to understanding
• Once you forget something learned by rote, there is little to fall back on
• If you understand and can visualise the numbers, if you forget you can figure it out again
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Visualising and OWNING maths learning
4+4=810=6+41+4=
I love math
I think that 4+4=8
10=6+4
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Early Years: Use Ten Frames
• Ten frames are the best resource for representing numbers up to 20
• Aim is to subitise patterns for each number
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Early Years: Use Ten Frames
• How many are here?
• How many now?
• Double ten frames:
1 5
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Addition & Subtraction Strategies
• Count on +1, +2, +3• Doubles, doubles +1• Rainbow facts• Near 10• Remaining facts
0 1 2 3 4 5 6 7 8 9 10
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Multiplication Strategies
• 2x: doubles• 10x, 5x: place value• 3x: double + one more• 4x: double double• 0x, squ nos: special cases• 9x: think of tens• 8x: double double double• 6x: build from known facts• 7x: build from known facts
6 x 2 = double 6 = 12
6 x 4 = double 12 = 24
6 x 8 = double 24 = 48
DOUBLING strategies:
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Nines Patterns
9 x 7 = ?
10 x 7 = 70 70 – 7 = 63
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Nines Patterns
• 9 x 1 = 9
• 9 x 2 = 18
• 9 x 3 = 27
• 9 x 4 = 36
• 9 x 5 = 45
• 9 x 6 = 54
• 9 x 7 = 63
• 9 x 8 = 72
• 9 x 9 = 81
• 9 x 10 = 90
0123456789
++++++++++
==========
9876543210
9999999999
9 x 7 =
1 less than
7
9 – 6 = 3
63
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Nines Patterns
1
23
4
5 6
78
9
10
9 x 7 = ?
6 3
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References
• Child’s drawing copied with permission from Aviva Dunsiger: http://missd.commons.hwdsb.on.ca/2012/05/11/school-point-of-view/
• All other graphics from Flickr, copied under Creative Commons License:• Question & ladder:StockMonkeys.com http
://www.flickr.com/photos/86530412@N02/8231156853/sizes/o/• Calculator:jakeandlindsay http://www.flickr.com/photos/jakeandlindsay/5639214967/sizes/o/• Little skier: The U.S. Military Academy at West Point http
://www.flickr.com/photos/west_point/4425431834/sizes/o/• Exam room: Z17R0 http://www.flickr.com/photos/42319778@N02/4923775302/sizes/o/• Sale notice: Danny Nicholson http://www.flickr.com/photos/dannynic/6363183821/sizes/l/• Duck family: kiwinz http://www.flickr.com/photos/kiwinz/4012597779/sizes/o/• Polluted beach: Vince Alongi http://www.flickr.com/photos/vincealongi/306696455/sizes/o/• Making Bubbles: Maxmroz http://www.flickr.com/photos/maxmroz/5758445169/sizes/o/• Robot 1: geishaboy500 http://www.flickr.com/photos/geishaboy500/108824992/sizes/o/ • Math Sculpture: NMC Second Life http://www.flickr.com/photos/nmc-campus/249565400/sizes/o/• Highway sign: quinn.anya http://www.flickr.com/photos/quinnanya/5798114796/sizes/o/• Climbing :Mathematical Association of America http://www.flickr.com/photos/maaorg/6348838232/sizes/l/• Toy Ducks: pterjan http://www.flickr.com/photos/cmoi/46192785/sizes/o/
• The Quote Garden 2013, Quotations about Math, http://www.quotegarden.com/math.html [Accessed 13 August 2013].
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OUR TIMES TABLES SOLUTION
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A Sequenced System for Memorisation of Number Facts
Yr 2
Yr 4Yr 5
Yr 3
Yr 6
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• Year 2:
• Lets Go!
• Year 3: • 10 Minutes a Day, Level 1
• Year 4: • 10 Minutes a Day, Level 2
• Year 5:
• 10 Minutes a Day, Level 3• Year 6-7:
• Bring It On!
“Developing Number Fluency” eBook series:
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Classroom Professor Gadgets Software
• Five modules:• Fraction Counter• Equivalent Fractions• Fraction Converter• Fraction Addition & Subtraction• Number Fact Exploration
• Designed for IWB use• Cross-platform (works on iPads)
• Follow-up worksheets eBook for each module
• Unlimited 12-month licenses
QUEDREX PD SESSION:Fractions are Tough to Teach,
and Difficult to Learn!
Saturday 12:45Sunday 10:45
Right here
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QUEDREX SPECIAL OFFERS
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QUEDREX-only Bundle #1
• Early Years (P-2) Bundle:• Ten Frames Bundle:• Flash Cards• Worksheets• Games
• Let’s Go! eBook series (4 eBooks)
• Introducing Fractions 1 & 2
Normally: $205 $109
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QUEDREX-only Bundle #2
• Year 3-7 Bundle:• Your choice of a 10 Minutes a
Day or Bring It On! eBook series (4 eBooks)
• Gadgets Software• cross-platform interactive• 5 titles + eBooks• 12-month classroom license
Normally: $270 $145
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QUEDREX-only Bundle #3
• School Bundle:• Entire Developing Number
Fluency series (20 eBooks)
• Gadgets Software• cross-platform interactive• 5 titles + worksheets eBooks• 12-month school site license
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More Information?• Free Maths Worksheets, Gadgets software trial:• Sign up at our QUEDREX stand
• Our resources: • store.classroomprofessor.com
• Questions / Comments / Feedback: • peter@classroomprofessor.com
• Web: • www.classroomprofessor.com
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