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Theory
Exercises
1. 
Rounding off to nearest tens and hundreds
Difficulty: easy 
3

2. 
Fill in the nearest hundreds and thousands
Difficulty: easy 
3

3. 
Check and say true or false
Difficulty: easy 
2

4. 
Estimate the sum
Difficulty: easy 
3

5. 
Calculate the difference in population
Difficulty: easy 
3

6. 
Determine the quotient
Difficulty: easy 
3

7. 
Determine the reasonable estimation (sum)
Difficulty: medium 
4

8. 
Choose the reasonable estimation (product)
Difficulty: medium 
4

9. 
Calculate estimated sum and difference of two numbers
Difficulty: medium 
2

10. 
Find the number with the help of its estimated value
Difficulty: medium 
4

11. 
Find the estimated cost
Difficulty: medium 
4

12. 
Caculate the estimated amount received
Difficulty: medium 
4

13. 
Determine nearest 10, 100, 1000
Difficulty: hard 
5

14. 
Estimate the sum and find the difference of acual and estimated value
Difficulty: hard 
5

15. 
Estimate by general rule
Difficulty: hard 
5

Tests
1. 
Training test
Difficulty: medium 
9

2. 
Training test
Difficulty: medium 
10
