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Question 1 of 6
hard
A trip is 8,000 m. After walking 3,450 m and 1,550 m, how far is left?
Explanation: 3,450 + 1,550 = 5,000; 8,000 − 5,000 = 3,000 m.
Question 2 of 6
hard
A rough estimate of 3,120 + 4,880 is…
Explanation: ≈ 3,000 + 5,000 = 8,000 (exact 8,000).
Question 3 of 6
hard
A town has 12,400 men and 11,890 women. How many people in total?
Explanation: 12,400 + 11,890 = 24,290.
Question 4 of 6
hard
By how much is 8,000 greater than 3,450?
Explanation: 8,000 − 3,450 = 4,550.
Question 5 of 6
hard
The sum of the smallest 4-digit number and the largest 3-digit number is…
Explanation: 1,000 + 999 = 1,999.
Question 6 of 6
medium
Estimate 7,840 − 1,960 (nearest 1000).
Explanation: 8,000 − 2,000 = 6,000.
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