# Proof: Shortcut Method of Squaring a Two Digit Number

This video explains how to square any two digit number without using a calculator and shows the proof.

# Square Any Two-Digit Number without Using Calculator

This video explains how to square any two digit number without using a calculator.

# Square a Two-Digit Number Ending in 5 without Using a Calculator

This video explains how to square a two-digit number ending in 5 without using a calculator.

# Curious Calculation: The Secret of 73

This video provides a curious calculation that always results in 73. The reason the calculation always results in 73 is explained.

# Bar Code Calculation to Determine The Check Digit

This video explains how to perform arithmetic using the digits of the bar code to determine the right most digit or check digit.

# A Pattern with the Product of 11 and Another 2 Digit Number

This video shows the pattern with a product of 11 and another 2 digit number.

# A Pattern Multiplying Numbers With 1’s in Each Place Value

This video explains the pattern when multiplying a counting number by itself with only one’s in each place value.