Answer:
32,456
32,123
31,723
Explanation:
To round a number to the nearest 1000, look at the digit next to thousand digit. If this next digit is 5 or more round up, else round down. Change all digits to the right of the thousands digit to 0
32, 456 ==> thousand place = 2 , next digit = 4 hence round down to 32, 000
31,723 ==> thousand digit is 1, next digit is 7 so round up to 32,000