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Which is smaller — 43,562 or 45,208?
43,562
How much larger is 65,000 than 48,725?
16,275
Combine 23,415 and 34,289.
57,704
Round 76,248 to the nearest thousand.
76,000
Why is it important to line up place values when adding or subtracting?
So each digit is added or subtracted correctly by value — ones with ones, tens with tens, etc.
Put these numbers in order from smallest to largest: 78,320; 87,203; 80,905.
78,320 → 80,905 → 87,203
The population of Town A is 92,308 and Town B is 75,642. How many more people live in Town A?
16,666
A company sold 45,732 tickets in March and 38,905 in April. How many tickets were sold in total?
84,637
Round 98,462 and 87,239 to the nearest ten thousand, then estimate their sum.
100,000 + 90,000 = 190,000
How can rounding help you check whether an answer makes sense?
It lets you estimate — if your exact answer is close to the estimate, it’s likely reasonable.
Arrange these four areas from smallest to largest: 96,100; 92,850; 101,230; 99,475
92,850 → 96,100 → 99,475 → 101,230
A forest covers 128,903 acres. A nearby lake covers 97,286 acres. How many more acres does the forest cover?
31,617
Add together 12,845; 14,923; and 9,307.
37,075
Estimate the total of 45,298 + 34,862 + 29,405.
45,000 + 35,000 + 29,000 = 109,000
If your exact answer is 152,376 but your estimate was 150,000, did your estimate make sense?
Yes — 152,376 is close to 150,000, so the estimate was reasonable.
A farmer owns four fields with areas of 82,970; 91,520; 79,468; and 86,705 square meters. List them from smallest to largest.
79,468 → 82,970 → 86,705 → 91,520
The tallest mountain is 14,387 ft; another is 12,958 ft. How much taller is it?
1,429 ft
A park system has areas of 42,568; 37,406; 19,275; and 28,934 acres. How many acres are there all together?
128,183
Estimate the difference between 126,745 and 98,201 using rounding.
127,000 − 98,000 = 29,000
A student added 27,849 + 34,208 and got 61,951. Explain one way they could check their work.
Use estimation (≈28,000 + 34,000 = 62,000) or check with subtraction (61,951 − 27,849 ≈ 34,102).