Mathematics 5 curriculum guide 2015 I table of contents acknowledgements



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k12 curriculum guides mathematics math 5 2015

Connections [CN]
Through connections, 
students begin to view 
mathematics as useful and 
relevant.


MATHEMATICS 5 CURRICULUM GUIDE 2015
5
MATHEMATICAL PROCESSES
Mental Mathematics and 
Estimation [ME]
Mental mathematics is a combination of cognitive strategies that 
enhance flexible thinking and number sense. It is calculating mentally 
without the use of external memory aids.
Mental mathematics enables students to determine answers without 
paper and pencil. It improves computational fluency by developing 
efficiency, accuracy and flexibility.
“Even more important than performing computational procedures or 
using calculators is the greater facility that students need—more than 
ever before—with estimation and mental math” (National Council of 
Teachers of Mathematics, May 2005).
Students proficient with mental mathematics “become liberated from 
calculator dependence, build confidence in doing mathematics, become 
more flexible thinkers and are more able to use multiple approaches to 
problem solving” (Rubenstein, 2001, p. 442).
Mental mathematics “provides the cornerstone for all estimation 
processes, offering a variety of alternative algorithms and nonstandard 
techniques for finding answers” (Hope, 1988, p. v).
Estimation is used for determining approximate values or quantities or 
for determining the reasonableness of calculated values. It often uses 
benchmarks or referents. Students need to know when to estimate, how 
to estimate and what strategy to use. 
Estimation assists individuals in making mathematical judgements and 
in developing useful, efficient strategies for dealing with situations in 
daily life.
Mental mathematics and 
estimation are fundamental 
components of number sense.

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