3.45 is a/an ___________.

Option 3 is correct as numbers represented using decimal point are called decimal numbers.

Which of the following is the correct decimal representation of the fraction 4/10?

Option 4 is correct as 4/10 has ten as the denominator, so, there will be a decimal point before 4 i.e 0.4

Which decimal number should be written in place of the '?' on the number line shown?

Option 2 is correct as ? is located 6 places after 1 towards right side. So, 1 is the whole and then 6 parts or 1.6

Fill in the blank using < , > or = 17.3 _____17.7

Option 3 is correct. In 17.3 and 17.7, the whole part 17 is same, so we will decide on the basis of values after decimal points. 7 is greater than 3. Hence 17.3 < 17.7

Samir ate 2/5 part of a pizza. How can the quantity of pizza eaten by Samir be represented in decimals?

Option 1 is correct. The given fraction is 2/5. To find the decimal value we must have the denominator in multiples of 10. Multiplying numerator and denominator by 2 we get (2 × 2) / (5 × 2) = 4/10 = 0.4