2. Example: 8 + 5
8+2=10, so lets take 2 from the 5: 8 + 2 + 3
and give it to the 8: 10 + 3 = 13
We can also move backwards to ten, by making the other
number bigger as needed:
Example: 12 + 7
Reduce 12 by 2: 12 − 2 = 10
Increase 7 by 2: 7 + 2 = 9
12 + 7 = 10 + 9 = 19
3. Compensation Method
"Compensation" is where you round up a
number (to make adding easier) and then take
away the extra after you have added.
Example 19+16
It is easier to do 20 + 16 = 36
Then take away the extra 1 (that made 19 into
20) to get: 35
Example 395 + 126
It is easier to do 400 + 126 = 526
Then take away the extra 5 (that made 395
into 400) to get: 521
4. Double when the numbers
are the same
Example 5 + 5 = 2 x 5 = 10
5. Double if the numbers are
close, then fix
Example: 5 + 6 is nearly two 5s,
but 6 is 1 bigger than 5, so:
5 + 6 = two 5s + 1 = 10 + 1 = 11
Example: 7 + 9 is like two 8s, but 7
is 1 smaller than 8, and 9 is 1
bigger than 8. So it is exactly two
8s because 1 smaller and 1 bigger
cancel each other:
7 + 9 = "8 less 1" + "8 add 1" = two
8s = 16
8. Step 1: Make sure the bottom numbers (the
denominators) are the same
Step 2: Add the top numbers (the numerators), put
that answer over the denominator
Step 3: Simplify the fraction (if needed)
9. 1/4 + 1/4
Step 1. The bottom numbers (the denominators) are already
the same. Go straight to step 2.
Step 2. Add the top numbers and put the answer over the same
denominator:
1/4 + 1/4 = (1+1)/4 = 2/4
Step 3. Simplify the fraction:
2/4 = 1/2
10.
11.
12. 10 Awesome Reasons Why Addition is Important in your Life
Shopping
Computers & Calculators
Ordering
Real numbers
Arithmetic
13. In literature & daily living
Building a family
Services
Birthdays, calendars, and events
Job Success
