Mental Math Grade 6 Teacher's Guide

Grade 5
Curriculum Outcomes Thinking Strategies
B10- estimate sums and differences
involving decimals to thousandths
B11- estimate products and quotients of
two whole numbers
B12- estimate products and quotients of
decimal numbers by single-digit
whole numbers
B15- multiply whole numbers by 0.1, 0.01,
and 0.001 mentally
C2- recognize and explain the pattern in
dividing by 10, 100, 1000 and in
multiplying by 0.1, 0.01 and 0.001
B13- perform appropriate mental
multiplications with facility
Grade 6
By grade 5, students should
possess a variety of strategies to
compute mentally. It is important
to recognize that these strategies
develop and improve over the years
with regular practice.
B9- estimate products and quotients
involving whole numbers only, whole
numbers and decimals, and decimals
only
B10- divide numbers by 0.1, 0.01, and 0.001
mentally
C2- use patterns to explore division by 0.1,
0.01, and 0.001
B11- calculate sums and differences in
relevant contexts using the most
appropriate method
P. 40 to 41 (Estimation)
• Rounding one up, one down
• Looking for compatibles that make
approximately 10, 100, 1000
• Front-end
P. 44
• Place-value-change strategy for mentally
multiplying by 10, 100, 1000
• “Halve-double” strategy for multiplication
• Front-end multiplication
• Compensation
P. 46 to 50
• Place-value-change strategy for mentally
dividing by 10, 100, 1000
• Place-value-change strategy for mentally
multiplying by 0.1, 0.01, 0.001
P. 40 (Estimation)
• Rounding one up, one down for
multiplication
• Front-end method for multiplication and
division
P. 42 and 50
• Place-value-change strategy for mentally
dividing by 0.1, 0.01, 0.001
P. 44
• Compensation in multiplication
• Front-end
Students should perform mental computations with facility using
strategies outlined in the Mental Math Guides.
Mental Math – Grade 6 5