“Lining up the decimal points” is the rote rule that children learn when adding and subtracting decimal fractions. The reasoning behind this rule is:
a. children are following the “one place value at a time” rule when adding and subtracting, similar to what they followed with whole numbers.
b. children will not add together or subtract the wrong numbers.
c. that base-10 blocks won’t be necessary for conceptual understanding in this case.
d. that real-life examples won’t be necessary for conceptual understanding in this case.
ANSWER:
a
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