Question

Ganpat's wife works in a tailor's shop. She has to fix lace around a table cloth.
She bought a 100 metre roll of lace.
• Look at the picture of the table cloth and tell how much lace is used for one table cloth. ____________




• How much lace will be used in 3 such table cloths? ____________
• How much lace will be left in the roll? ____________

Answer 1

• We know

1 m = 100 cm

Length of the table cloth = 1 m 50 cm
= 1 × 100 cm + 50 cm
= 100 cm + 50 cm
= 150 cm
Width of the table cloth = 50 cm
Length of the boundary of the cloth = 150 + 50 + 150 + 50
= 400 cm
= 4 m
Working:
$\begin{array}{cccc}& 1& 5& 0\\ & 1& 5& 0\\ & 0& 5& 0\\ +& 0& 5& 0\\ & 4& 0& 0\\ & & & \end{array}$
Thus, the length of lace needed for one table cloth is 4 m.

• Length of lace required for one table cloth = 4 m

Length of lace required for three table cloths = 4 m × 3
= 12 m

• Total length of the roll of lace = 100 m

Length of lace used in three table cloths = 12 m
Length of lace left in the roll = 100 m − 12 m
= 88 m
Working:
$\begin{array}{cccc}& 1& 0& 0\\ -& 0& 1& 2\\ & 0& 8& 8\\ & & & \end{array}$
Thus, 88 m of lace is left in the roll.