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Math 3x9=()x3 10 () x3 in the second grade of primary school.
Math 3x9=()x3 10 () x3 in the second grade of primary school.

Solution:

3x9= 1x3 18x3

3x9=2x3 17x3

3x9=3x3 Ten 6x3

etc

because

3x 9 = 3x( 1+8)= 3x(2+7)= 3x(3+6)= 3x(4+5)

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