Estimated and actual
292+406
777+111
463+512
909+349
530+650
To find the estimated sum, you can round each number to the nearest ten and then add them together. To find the actual sum, you simply add the numbers without rounding.
Let's go through the calculations step by step:
1. Estimated sum of 292 + 406:
To estimate, round 292 to the nearest ten, which is 290, and round 406 to the nearest ten, which is 410. Now add them together:
Estimated sum = 290 + 410 = 700.
To find the actual sum, add the numbers without rounding:
Actual sum = 292 + 406 = 698.
2. Estimated sum of 777 + 111:
Round 777 to the nearest ten, which is 780, and round 111 to the nearest ten, which is 110. Add them together:
Estimated sum = 780 + 110 = 890.
Actual sum = 777 + 111 = 888.
3. Estimated sum of 463 + 512:
Round 463 to the nearest ten, which is 460, and round 512 to the nearest ten, which is 510. Add them together:
Estimated sum = 460 + 510 = 970.
Actual sum = 463 + 512 = 975.
4. Estimated sum of 909 + 349:
Round 909 to the nearest ten, which is 910, and round 349 to the nearest ten, which is 350. Add them together:
Estimated sum = 910 + 350 = 1260.
Actual sum = 909 + 349 = 1258.
5. Estimated sum of 530 + 650:
Round 530 to the nearest ten, which is 530 (no change), and round 650 to the nearest ten, which is 650 (no change). Add them together:
Estimated sum = 530 + 650 = 1180.
Actual sum = 530 + 650 = 1180.
So, the estimated and actual sums for the given number pairs are:
292 + 406: Estimated sum = 700, Actual sum = 698.
777 + 111: Estimated sum = 890, Actual sum = 888.
463 + 512: Estimated sum = 970, Actual sum = 975.
909 + 349: Estimated sum = 1260, Actual sum = 1258.
530 + 650: Estimated sum = 1180, Actual sum = 1180.