Tyrone asked Mr. Jones what the answer to 0.7 × 0.3 would be. Which of the following is the best method that Mr. Jones could use to help Tyrone understand this problem conceptually?
a. Mr. Jones could tell him to count the number of decimal places to the right of each decimal, then to multiply the two numbers as if they were whole numbers, and count back that number of places from the right.
b. Mr. Jones could tell him to use base-10 pieces for each decimal, by laying down 7 longs 3 times, then to go back one decimal.
c. Mr. Jones could tell him to change each decimal into fractions, multiply out the fractions, then change back into decimals.
d. Mr. Jones could tell him to add 7 tenths three times, then to divide by one tenth.
ANSWER:
b
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