A number line is a faster, more efficient way of calculating whole numbers, and only takes a few seconds, a lot faster than mental calculation.
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order the numbers from least to greatest
they all are digit numbers
Fractions help with numbers that are not whole numbers.
Rewriting the fractional part of the two numbers as a percentage, can help you compare the two numbers.
Whole number computation is 90% of decimal computation. The difference is that you need to understand where to put the decimal point in the answer. It's impossible to do decimal computation without knowing how to do whole number computation.