439 + 71 = 510
680 + 440 = 1120
520.
439 + 71 = 439 + 1 + 70 = 440 + 70 = 510. Who needs a ball park estimate when the exact answer is just as easy to find?
nothing at all
439 + 746 = 1185
A quicker way of writing 254 + 254 + 254 is 3 x 254, or three multiplied by 254. The answer is 762.
87794 + 39357 + 180 + 439 = 127,770
2 + 254 = 256
276 + 254 = 530.
254 + 343 = 597
210