The associative property. It works separately for addition and for multiplication.
1x82x4
Yes
Infinite
Infinitely many.
The commutative property of addition and the commutative property of multiplication.
The associative property. It works separately for addition and for multiplication.
proper fraction
22x111x21x222x11
1x82x4
in a math book
Yes
Infinite
This is most often defined as the set of multiplication problems created by single-digit numbers. It includes problems from 1 x 1 to 9 x 9. Some people extend the definition to include multiplication problems up to 12 x 12.
Multiplication problems can be solved by consulting a multiplication table. Large numbers can be multiplied using a technique called Long Multiplication. One can also use an electronic calculator.
9*6=54
Infinitely many.