Test: Measuring Length - Class 4 MCQ

To convert the length of the rod from metres to centimetres, we use the conversion factor where:

• 1 metre = 100 centimetres

Therefore, multiplying:

• 5 metres × 100 = 500 centimetres

1 meter is equivalent to 100 cm.

• Therefore, comparing the lengths:
  • A: 75 cm
  • B: 100 cm
  • C: 90 cm
  • D: 50 cm
• The longest length is 1 meter, which is 100 cm.

Look at the hundreds place in each number:

• 175 has 1 hundred

• 125 also has 1 hundred

They are equal in the hundreds place.

Now look at the tens place:

• 175 has 7 tens (70)

• 125 has 2 tens (20)

Since 70 > 20, we can say:

175 > 125

A ruler is small and perfect for measuring objects like pencils or erasers in centimeters.

The standard unit of measuring length is a meter. It is done by a ruler. 

Compare Hundreds Place

• 90 has 0 hundreds

• 120 has 1 hundred

Since 0 < 1, we can say: 90 < 120

Conclusion:
90 cm is less than 120 cm, so the correct comparison is:

90 cm < 120 cm

To determine how many centimetres are in half a metre, follow these steps:

• 1 metre is equal to 100 centimetres.
• Half a metre is 0.5 metres.
• Therefore, half a metre is 0.5 × 100 = 50 centimetres.