Question

Find out the multiplication by proper order. 

(i) 4 × 1225 × 25 

(ii) 4 × 158 × 125 

(iii) 4 × 85 × 25 

(iv) 8 × 20 × 125

Answer 1

Multiply under associativity – 

(i) (4 × 1225) × 25 = 1225 × (4 × 25) 

4900 × 25 = 1225 × 100 = 122500 

(ii) (4 × 158) × 125 = 158 × (4 × 125) 

632 × 125 = 158 × 500 = 79000 

(iii) (4 × 85) × 25 = 85 × (4 × 25) 

340 × 25 = 85 × 100 = 8500 

(iv) (8 × 20) × 125 = 20 × (8 × 125) 

160 × 125 = 20 × 1000 = 20000