Question

1. 20

x 64

Explanation:

Step1: Multiply by units digit

Multiply 20 by 4: $20\times4 = 80$.

Step2: Multiply by tens digit

Multiply 20 by 60: $20\times60=1200$.

Step3: Add results

Add the two products: $1200 + 80=1280$.

Answer:

1280