Question

Ravi and Raju measured the lengths of their pencils. Ravi’s pencil was 7cm and 5mm long and Raju’s pencil was 8cm and 3mm long. Express these lengths in cm.

Answer 1

1 cm=10mm
hence 5 mm=0.5cm
ravis pencil= 7.5 cm
3mm=0.3mm
rajus pencil = 8.3cm

Answer 2

Correct Question

Ravi and Raju's measured the lengths of their pencils. Ravi’s pencil was 7cm and 5mm long and Raju’s pencil was 8cm and 3mm long. Express these lengths in cm.

Solution

In this question,We have given that Ravi and Raju's measured the lengths of their pencils.Ravi's pencil was 7 cm and 5mm long and Raju's pencil was 8cm and 3mm long.So,We have to express these lengths in cm.

Let's Solve!

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We know that,

10 mm = 1 cm

Therefore,1mm = 1/10 cm or one - tenth cm = 0.1 cm.

Now,

Length of Ravi's pencil = 7cm 5mm

= 7 5/10 cm

= 7.5 cm

The length of Raju's pencil = 8cm 3mm

= 8 3/10 cm

= 8.3 cm