Four multiplied by 65 is 260.
290 - 30 = 260
539
To the nearest ten, 260
260
195% of 260= 195% * 260= 1.95 * 260= 507
38% of 260= 38% * 260= 0.38 * 260= 98.8
2% of 260 = 2% * 260 = 0.02 * 260 = 5.2
31% of 260= 31% * 260= 0.31 * 260= 80.6
260
round off each of the numbers and add together: 114 + 257 is about 110 + 260 = 370. Exactly how you round off or approximate the numbers depends on how good you need the estimate to be.
260