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Mental Maths

21 st
Century #Critical Thinking
Choose the correct option. Skills

1. Which one of the following is used to measure the weight of a rice bag?
a. Compass b. Thermometer c. Balance d. Ruler

2. Which unit is used to measure the weight of a television?
a. kg b. mg c. m d. km

3. 7 kg 784 g can be converted into g as:

a. 7784 g b. 7846 g c. 6874 g d. 6847 g

4. Each tea packet weighs
1 kg
a. a half kilogram
b. a quarter kilogram

c. a kilogram
d. three-quarters of a kilogram

HOTS

21 st
Century #Subject Enrichment
Skills
1. For a balance scale where weights can be placed on the same pan as the object or
on the opposite pan, what is the smallest set of standard weights needed to accurately
determine every mass from 1 kg to 40 kg?

2. Simmi has 3 bags of the same size but not the same
weight. Simmi has to find out which is the heaviest. She
has a balance but no weights. Can you explain to Simmi
how she can find out which bag is the heaviest?

A B C

168 Mathematics 3