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  A D D I T I O N - Table   The addition table contains 400 additions.
+ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
 O (zero) is not
 included; adding O       
 (
zero) to any number
 results in the same
 number.
 Pick a number (digit)
 on the top horizontal
 line; [
add(+)] with a
 number on the far left
 vertical line. Move
 right on this vertical
 line until the relevant
 horizontal line is
 reached.
 E.g. 3+5=8 Note: 3+5
 
has the same result as
 
5+3=8
 Shaded boxes are
 doubles of digits e.g.
 2+2=4
 Going from left to right in any row, or from top to bottom in any column, each new number is 1
 more (
+) than the previous number (successor). Successors are a Sequence of numbers e.g. 0, 1,
 
2,
3, 4, 5, ...  Every healthy individual over 7 years of age should be able to do all 400 additions in
 their head.  Inability shows lack of Education or health-issues.
   Study-advise : Adding
 When studying or teaching not only research
 this site but a variety of others.

 UM: Useful mathematics

 PM: Pure
 mathematics

 CM: Challenging mathematics

 Rule: Addend + Addend = Result
 UM: You buy 1 red apple then buy 2 green
 apples. That's how many apples? 
 A: 1 red apple & 2 green apples or combined 3
 apples
 1 apple + 2 apples =
 3 apples
 PM: 1 + 2 = 3
 Rule: 1 + 2 = 3, 2 + 1 = 3 Addends can be
 swapped
result is the same.  You can swap to
 check result.
 UM: There is 1 empty bag & a bag with 3 red
 apples. How many apples in both bags?
 0 apples + 3 apples
 
= 3 apples
 PM: 0 + 3 = 3, 3 + 0 = 3
 CM: add contents of each bag & then the
 content of both bags.  (0) + (1+1+1) = 0 + 3 =
 
3, (1+1+1) + (0) = 3 + 0 = 3
 Rule: 0 + 3 = 3. Nothing + Addend result is
 the Addend.