Repeated addition by 20’s means the multiplication table of 20.
(i) When 5 candlestands having 20 candles each.
By repeated addition we can show 20 + 20 + 20 + 20 + 20 = 100
Then, twenty 5 times or 5 twenty’s
5 × 20 = 100
Therefore, there are 100 candles.
(ii) When 8 bundles of 20 pencils each.
By repeated addition we can show 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20= 160
Then, twenty 8 times or 8 twenty’s
8 × 20 = 160
Therefore, there are 160 pencils.
We will learn how to use the number line for counting the multiplication table of 20.
(i) Start at 0. Hop 20, three times. Stop at 60.
3 twenty’s are 60 3 × 20 = 60
(ii) Start at 0. Hop 20, ten times.
Stop at ____. Thus, it will be 200
10 twenty’s are 200 10 × 20 = 200
(iii) Start at 0. Hop 20, twelve times.
Stop at ____. Thus, it will be 240
12 twenty’s are 240 12 × 20 = 240
How to read and write the table of 20?
The above chart will help us to read and write the 20 times table.
Read 1 twenty is 20 2 twenty’s are 40 3 twenty’s are 60
4 twenty’s are 80 5 twenty’s are 100 6 twenty’s are 120 7 twenty’s are 140 8 twenty’s are 160 9 twenty’s are 180 10 twenty’s are 200 11 twenty’s are 220 12 twenty’s are 240 
Write 1 × 20 = 20 2 × 20 = 40 3 × 20 = 60 4 × 20 = 80 5 × 20 = 100 6 × 20 = 120
7 × 20 = 140 8 × 20 = 160 9 × 20 = 180 10 × 20 = 200 11 × 20 = 220 12 × 20 = 240 
Now we will learn how to do forward counting and backward counting by 20’s.
Forward counting by 20’s: 0, 20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 220, 240, 260, 280, 300, 320, 340, 360, 380, 400, 420, 440, 460, 480, 500, ……
Backward counting by 20’s: ……, 500, 480, 460, 440, 420, 400, 380, 360, 340, 320, 300, 280, 260, 240, 220, 200, 180, 160, 140, 120, 100, 80, 60, 40, 20, 0
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