1. Prepare drawing tools and materials: a large piece of paper or newspaper, a colored drawing pen or marker, a ruler and a pencil.
2. Write the title text of "multiplication formula" in the middle of the top of the picture, and draw patterns such as clouds, sun and stars at the top of the picture to decorate the title text.
3. Draw patterns such as little boy and little girl in the bottom left corner of the picture, and draw patterns such as books, grass and flowers in the middle of the picture to decorate the edge line.
4. Draw irregular rectangular borders on the left and right sides of the handwritten newspaper screen, and draw a book pattern decorative border line in the lower right corner of the screen.
5. After drawing lines, you can color them. The text in the middle of the top of the picture is drawn in red, orange and purple, and the clouds at the top of the picture are drawn in blue.
6. Then paint the characters in the lower left corner with black, blue, pink and orange, and paint the books and flowers at the bottom with green, purple and orange.
7. Draw the background color of the handwritten newspaper border with yellow and blue, and finally draw grid lines on the left and right borders.
Calculation method:
The common methods of using pencil and paper multiplier need a small number (usually any two numbers between 0 and 9) to store or query the product multiplication table, but a farmer multiplication algorithm does not need it. Multiplying a number with multiple decimal places is troublesome and error-prone.
The universal logarithm was invented to simplify this calculation. The slide rule allows numbers to be quickly multiplied by about three digits of precision. Since the early 20th century, mechanical calculators, such as Marchant, have automatically multiplied as many as 10 digits. Modern electronic computers and calculators greatly reduce the need for manual multiplication.