Question

$6$ fewer oil cans, out of $15$ are actually used. Use the ‘make a $10$’ strategy to find out how many oil cans are actually used?

• A. $10$
• B. $6$
• C. $7$
• D. $9$

Answer 1

The correct option is D $9$

Say: Let’s read the question.

Ask:
$\bullet$ Do we add $15$ and $6$ to find the number of cans that are actually used, and why?
Ans: No, we subtract $6$ from $15$ to find the number of cans that are actually used, because instead of $15,6$ fewer oil cans are used. So the number of oil cans used will be less than $15.$
$\bullet$ How will we make a ten to subtract?
Ans: We can split $6$ into $5$ and $1$ so that we make $15$ a $10$ by subtracting $5$ from $15.$
$\bullet$ What do we do next?
Ans: We subtract the remaining $1$ from $10$ to get $9$ as the difference. $10–1=9$
Hence, option A is the correct answer.

WB: If required, use the whiteboard to show the solution.