Monday, October 1, 2012

Subtraction Facts Online

Introduction to subtraction facts online:
Subtracting is one of the easiest methods to learn quickly. The process of subtraction is to find the difference between the two numbers. When we have two numbers are equal then the result will be 0.

In general, to take the one part away from another

Example:

Take 3 apples away from 10 apples

Solution:

10 apples – 3 apples = 7 apples.

Description to Subtraction Facts Online:
standard methods for subtraction facts online:

The algorithm for subtracting facts a whole number naturally is not the only one, some people prefer using the borrow payback method of subtraction. The problem 426 – 189 would be done as follow

426       10 ones added to sum (notice no regrouping)

189       Addition 10 subtracted. By adding to the sum of 10 ones and to the missing addend.

257        the final answer is  257.

Borrow-payback subtraction method may be confusing some times, but it could be because it is a new method. Some subtraction problems in that way and we may grow to like it, it is you obligation to teach subtract.

A common error appears in subtraction facts the little number form the big one in each place value column. Thus the problem

5123 – 1684 would be 4561. Integer subtraction is normally takes the little number form the greater one in every column. The problem 5123 – 1684 would be

5123

-1684

-1  (3 – 4 = -1)

-60 (20 – 80 = -60)

-500 (100 – 600 = -500)

+4000 (4000 – 500 -60 -1 = 3439)

This is one of the easiest method to learn subtraction facts online.

Example Problem for Subtraction Facts Online:

Find the subtraction facts for the given problem.

1)      7+4 = 11

Subtraction facts are

11-4 =7 and

11-7 = 4

(note: when we change the order to subtract ,then result will be based on the numbers which we taken to do the subtraction process.)

Example 2) 8+5=13

Solution:

13-5=8 and

13-8 =5.

Online Practice problems on subtraction facts:

State the subtraction facts for the following examples:

1)      Find the subtraction facts: 17+3 =20

A) 20-17=3 and 3-20=17

B) 17-20 =3 and 20-3=17

C) 3-20=17 and 20-17=3

D) 20-3=17 and 20-17=3

2)      Find the subtraction facts : 3+7 =10

A) 10 - 3 = 7, 10 - 7 = 3

B) 10 - 3 = 7, 10 - 7 = 7

C) 10 - 3 = 3, 10 - 7 = 3

D) 10 - 3 = 3, 10 - 7 = 7

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