Whats the greatest ten you can multiply by 19 to get close to but not go over 684

The desired expression is 19 x (3 tens) = 19 x 30 = 570

So, the greatest ten = 3 (tens)

Step-by-step explanation:

Let us check each tens.

19 x (1 ten) = 19 x 10 = 190

19 x (2 tens) = 19 x 20 = 380

19 x (3 tens) = 19 x 30 = 570

19 x (4 tens) = 19 x 40 = 760

But, here 760 is OVER the given term 684.

and 570 is the nearest value to the value 684.

So, the desired expression is 19 x (3 tens) = 19 x 30 = 570