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Help videos:
www.nummolt.com/modulo/index.html

Nummolt Modulo applet. Help 0. Base 10 blocks. ℕ

Playing with 144.
Video help of the nummolt modulo applet at:
www.nummolt.com/modulo/index.html

Nummolt Modulo applet. Help 1. Basic use. ℕ

Basic use: 55+66+66+78
Video help of the nummolt modulo applet at:
www.nummolt.com/modulo/index.html

Nummolt Modulo applet. Help 2. Polygonal Numbers. ℕ

The addition of two consecutive triangular numbers, is a square number.
The addition of two times a triangular number and the consecutive triangular number, is a pentagonal number.
The addition of three times a triangular number and the consecutive triangular number, is a hexagonal number (and a triangular number, also)
Video help of the nummolt modulo applet at:
www.nummolt.com/modulo/index.html

Nummolt Modulo applet. Help 3. Modular arithmetic. Math magic ℤ

Pick a random two digits number.
Add both digits.
Subtract the result from the initial number.
The result is ever a multiple of 9.
Examples: 25; 43; 55; 89
Video help of the nummolt modulo applet at:
www.nummolt.com/modulo/index.html