Area Model Multiplier: the Box Method, Partial Products, the Standard Algorithm and Lattice

Home › Calculators › Area Model Multiplier

Opens on Chapter 7’s example: 34 × 27 = 600 + 80 + 210 + 28.

First number up to 4 digits

Second number up to 3 digits

Load another example from the book

Enter the numbers from the worksheet, then press Show me.

From the book, Chapter 7. 34 × 27 = 600 + 80 + 210 + 28 = 918. In the standard algorithm, 34 × 7 = 238 is the first line and 34 × 20 = 680 the second: the zero you were told to “put down” is there because the 2 means two tens. Estimate first: 30 × 30 = 900, so 918 is sensible and 9,180 isn’t.

Every step is worked exactly, the way the chapter does it. Everything stays in your browser: no sign-up, nothing stored or sent.