1. Tom is 73 km away from his house. Round the distance to the nearest 10.
2. Estimate 450 + 100 = ?
3. Fill in the blanks: 208 + 420 is the same as 200 +?
4. Fill in the blanks: 60 + 23 is the same as? + 24
5. 30 + 45 =?
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