More repetition fun in division

6

November 8, 2019

Multiply into double no

4

November 8, 2019

Some special case in multiplication

6

November 6, 2019

How to calculate square root of complex no in mind

5

November 6, 2019

Fast division by 23

9

November 6, 2019

**Conjugate of complex no**

1

November 6, 2019

Think! There is always an easier way

29

November 6, 2019

Special number 1001

9

November 5, 2019

How to learn tables of maths

1

November 5, 2019

Best way to calculate + commit to memory a table with odds/ratios/%?

12

October 31, 2019

How to calculate factorial number

4

October 31, 2019

How to do calendar calculations

5

October 23, 2019

Duplex method for square roots

4

October 20, 2019

How to calculate day from date of birth

8

October 20, 2019

Multiplication table (99x99)

6

October 18, 2019

Multiplication a more efficient algorithm

1

October 17, 2019

Three digit division

4

October 17, 2019

How to calculate squares quickly

8

October 17, 2019

Divisibility and simple osculators

4

October 16, 2019

Division Mentally

6

October 15, 2019

Mental Multiplication: Useful Facts and Exercises

5

October 12, 2019

Expert mathematicians stumped by simple subtractions

6

October 11, 2019

Is abacus speed calculation really useful or just a gimmick?

10

October 7, 2019

Mental Calculation  Basics ( Complements )

8

October 7, 2019

Prime numbers... useful applications?

8

October 6, 2019

Left to Right method for large numbers  Carrying problem

9

October 5, 2019

Avoiding the carry

8

October 2, 2019

Calculating Logarithms on a Soroban

2

October 2, 2019

Soroban Finger Exercises

4

October 1, 2019

Mental Abacus

10

September 30, 2019
