Chapter 1 - Whole Numbers - 1.4 Multiplying Whole Numbers - 1.4 Exercises - Page 40: 97

$21 \times 43 \times 56 = 50,568$

General Equation: $a \times b \times c$ 1. Multiply the two numbers together $(a \times b)$ $(21 \times 43) = 903$ New Equation $= (903) \times 56$ 2. Multiply the last two numbers together $((a \times b) \times c)$ $903 \times 56 = 50568$