question

Here is a script you can run:

treenode table1 = reftable("GlobalTable1");
treenode table2 = reftable("GlobalTable2");
treenode table3 = reftable("GlobalTable3");

for(int i = 1; i <= gettablerows(table1); i++){
	for(int j = 1; j <= gettablecols(table1); j++){
		int value = gettablenum(table1, i, j) * gettablenum(table2, i, j);
		settablenum(table3, i, j, value);
	}
}

If you only want to do the first row change i <= gettablerows(table1) to i <= 1.

If you upgrade to 17.0 you can use dot syntax:

Table table1 = reftable("GlobalTable1");
Table table2 = reftable("GlobalTable2");
Table table3 = reftable("GlobalTable3");

for(int i = 1; i <= table1.numRows; i++){
	for(int j = 1; j <= table1.numCols; j++){
		table3[i][j] = table1[i][j] * table2[i][j];
	}
}