Nine boards are stacked on the top of each other. The thickness of each board is $3 \frac{2}{3}$ cm. How high is the stack?

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Solution

Thickness of 1 board = $3 \frac{2}{3}$ cm
∴ Thickness of 9 boards = $(9 \times 3 \frac{2}{3}) cm$
= $(\frac{9}{1} \times \frac{11}{3}) cm$ = (3 $\times$ 11) cm = 33 cm

Hence, the height of the stack is 33 cm.

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Nine boards are stacked on the top of each other. The thickness of each board is 323 cm. How high is the stack?

Thickness of 1 board = 323 cm ∴ Thickness of 9 boards = 9×323 cm =91×113 cm = (3 × 11) cm = 33 cm Hence, the height of the stack is 33 cm.

Nine boards are stacked on the top of each other. The thickness of each board is $3 \frac{2}{3}$ cm. How high is the stack?

Thickness of 1 board = $3 \frac{2}{3}$ cm
∴ Thickness of 9 boards = $(9 \times 3 \frac{2}{3}) cm$
= $(\frac{9}{1} \times \frac{11}{3}) cm$ = (3 $\times$ 11) cm = 33 cm

Hence, the height of the stack is 33 cm.