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A number with more than 2 digits must be at least 100. Any two numbers of this kind will give an answer that is at least 10000. So there are no ways to make 144 with multiplication of numbers with more than 2 digits.
Because that's how the addition and multiplication functions were defined.
Multiplication by an integer is the same as repeated addition.
Simple and Traditional multiplication. Then there is Long Multiplication. used for larger numbers. e.g. Simple multiplication 3 x 2 = 6 Long Multiplication. 33 x 22 = 33 x 22 660 66 726 ====
Multiply:1x15=1515x1=153x5=155*3=15*With multiplying fractions, there are an infinite number of ways to get the product of 15, but the four listed above are used by multiplying whole numbers.