Tuesday

March 3, 2015

March 3, 2015

Posted by **zeke** on Sunday, January 7, 2007 at 10:14am.

Let's use this addition problem as an example.

21

35

___

First you add 1 + 5. To check your work, add up, 5 + 1.

If you have a column of numbers and you go down each column to add them together, that's normal, right?

36

95

146

To check to make sure you're right, you'd add

15

95

146

That's called

When my mother was working for her father in the family business (long before calculators or computers) and had to add long columns of numbers, adding down was the standard; then adding up was the double-check.

=)

thank you.

thank you,that was very helpful.

**Answer this Question**

**Related Questions**

MATH - What are the 3 property names of addition? 1. The Zero Property of ...

math - Show how to make one addend the next ten number. complete the new ...

MATH - What is commutative property of addition? The commutative property of ...

Math - i can't find these patterns. my mom and dad tried to. first problem 64,__...

One more 5th grade adding letter problem - I thought I was getting the hang of...

math - in the addition problems below each leter represents the same digit in ...

Grade 3 math - Never thought I would have a problem with Gr. 3 math - lol - but ...

math - what are the 5 steps to addition? what are you adding? i know the five ...

Chemistry - How do you determine that a certain reagent will result in syn ...

Another Problem...PLz Help COunt Iblis - Statements Reasons 1. 3x - 7 = -4 2. 3x...