Exact and approximate values, measurement error, ≈, rounding to tens
Answers are for parents and teachers.
1
The true length is 120 mm and the measured one is 118 mm. How many mm is the error?
2
2
4 997 ≈ 5 000. What is the difference?
3
3
Round 86 to the nearest ten.
90
4
Round 3 451 to the nearest ten.
3 450
5
A pencil costs 2 500 sum. Exactly how many sum do 4 pencils cost?
10000