'Mental subtraction' presentation slideshows

Mental Subtraction

560 views • 24 slides

February 5, 2009

346 views • 18 slides

Mental Subtraction

Mental Subtraction. In your head, compute: 65 - 28 71 - 39 80 - 46 Explain what you did so that a second grader will understand. Subtraction. Vocabulary: A - B = C A is the minuend B is the subtrahend C is the difference. Try this:. Is A - B = B - A? 6 - 4 = 4 - 6?

554 views • 17 slides

Cakes and Calculations

Cakes and Calculations. Subtraction. Mental Strategies for Subtraction. Secure mental subtraction requires the ability to: recall key subtraction facts instantly (inverse of number pairs to 10, 20 & 100, halves etc) and to apply these to similar calculations

300 views • 8 slides