How negative times negative is positive?

Understand arithmetic operations of positive and negative integers using Modelling.

Addition of two integers – part 1 – https://youtu.be/cYvXk1IEcSo
Addition of two integers – part 2 – https://youtu.be/tSyjgopeGe4
Comparison of integers – https://youtu.be/ouJk2tAVL9A
Subtraction of integers part 1 – https://youtu.be/9m6ygsDMPVk
Subtraction of integers part 2 –
https://youtu.be/A_hm910jaLU
Multiplication of integers – https://youtu.be/SOorMyrNr3c