MENTAL MATH PART III

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# MENTAL MATH PART III - PowerPoint PPT Presentation

MENTAL MATH PART III. SUBTRACTION &amp; THE LAST OF HWK #1. SUBTRACTION -TRADING ONE PROBLEM FOR ANOTHER. If you would like to change A-B to an easier problem then you should do what to the numbers to assure that you get the same answers?

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### MENTAL MATH PART III

SUBTRACTION & THE LAST OF HWK #1

SUBTRACTION -TRADING ONE PROBLEM FOR ANOTHER

If you would like to change A-B to an easier problem then you should do what to the numbers to assure that you get the same answers?

Add or subtract the same number to both. Make the number you subtract as easy as possible to work with!

EXAMPLES
• 198-89

=209-100=109

• 1533-367

= 1566-400=1166

• 121-88

=123-90

=133-100=33

One More Example

2021-857

=2024-860

=2064-900

=2164-1000

=1164

Compensating one digit at a time

3091

-867

------------

2

2

2

4

7 to 10 is 3

3+1 =4

But the 9 is now an 8.

8-6 is 2

8 to 10 is 2

0+2 is 2

But the 3 is now a 2.

Each letter is a different digit – find them!

If you get stuck just text me at

7757220658

For a hint!