Given that 18 × 12 = 216, find the products: (a) 18 × 1.2; (b) 18 × 0.12: Class 7

Given that 18 × 12 = 216, find the products: (a) 18 × 1.2; (b) 18 × 0.12: Class 7

Question 1.

Given that 18 × 12 = 216, find the products : Class 7

(a) 18 × 1.2

(b) 18 × 0.12

(c) 1.8 × 1.2

(d) 0.18 × 0.12

(e) 0.018 × 0.012

(f) 1.8 × 12

In which of the cases above is the product less than 1?

Solution:

(a) 21.6

(b) 2.16

(c) 2.16

(d) 0.0216

(e) 0.000216

(f) 2.16

In (d) and (e), product is less than 1.

Question 2.

In which of the following multiplications is the product less than 1? Can you find the answer without actually doing the multiplications? Class 7

(a) 7 × 0.6

(b) 0.7 × 0.6

(c) 0.7 × 6

(d) 0.07 × 0.06

Solution:

Product is less than 1, in (b) and (d). Yes, by looking at the number of decimal places in the numbers.