Answer: A) 125,675 + 557,056 and E) 32,057 + 634,089.
Explanation:
To determine which number sentences have a sum less than 684,560, we need to add the given numbers and compare the sums to 684,560. Let's go through each option:
A) 125,675 + 557,056 = 682,731
The sum of these numbers is less than 684,560.
B) 451,345 + 267,950 = 719,295
The sum of these numbers is greater than 684,560.
C) 489,532 + 186,734 = 676,266
The sum of these numbers is less than 684,560.
D) 345,000 + 344,550 = 689,550
The sum of these numbers is greater than 684,560.
E) 32,057 + 634,089 = 666,146
The sum of these numbers is less than 684,560.
Based on these calculations, the number sentences that have a sum less than 684,560 are A) 125,675 + 557,056 and E) 32,057 + 634,089.