Answer with explanation:
20 +26
Why counting by 1, is not the fastest way to add 26 with 20 on number line because, adding 1 to 20 , 26 times is a tedious process.It will look rough to add number 1, 26 times on number line,which is sometimes confusing and irritating.
So, we will look out the factors of 26 , which are 1, 2, 13 , and 26.
So, adding 13 twice to 20 ,that is , 20+13+13, on the number line looks filthy.
It will be precious, to (add number 2, 13 times=26), to 20 , to get the required result.That is
20 +26= 20 +2+2+2....13 times.
