Problem Analysis:
The task involves rounding numbers to the nearest 10 and the nearest 100. The instructions provide a number line as a visual aid to help with rounding. Let's break it down step by step.
---
Part 1: Rounding to the Nearest 10
We are given the following numbers:
- 26
- 73
- 49
- 86
- 51
####
Rounding Rules for Nearest 10:
- If the digit in the ones place is
5 or greater, round up.
- If the digit in the ones place is
less than 5, round down.
####
Step-by-Step Solution:
1.
26: The ones digit is 6 (greater than 5). Round up to 30.
-
Answer: 30
2.
73: The ones digit is 3 (less than 5). Round down to 70.
-
Answer: 70
3.
49: The ones digit is 9 (greater than 5). Round up to 50.
-
Answer: 50
4.
86: The ones digit is 6 (greater than 5). Round up to 90.
-
Answer: 90
5.
51: The ones digit is 1 (less than 5). Round down to 50.
-
Answer: 50
####
Final Answers for Part 1:
- 26 →
30
- 73 →
70
- 49 →
50
- 86 →
90
- 51 →
50
---
Part 2: Rounding to the Nearest 100
We are given the following numbers:
- 320
- 890
- 460
- 610
- 550
- 940
####
Rounding Rules for Nearest 100:
- If the digit in the tens place is
5 or greater, round up.
- If the digit in the tens place is
less than 5, round down.
####
Step-by-Step Solution:
1.
320: The tens digit is 2 (less than 5). Round down to 300.
-
Answer: 300
2.
890: The tens digit is 9 (greater than 5). Round up to 900.
-
Answer: 900
3.
460: The tens digit is 6 (greater than 5). Round up to 500.
-
Answer: 500
4.
610: The tens digit is 1 (less than 5). Round down to 600.
-
Answer: 600
5.
550: The tens digit is 5 (equal to 5). Round up to 600.
-
Answer: 600
6.
940: The tens digit is 4 (less than 5). Round down to 900.
-
Answer: 900
####
Final Answers for Part 2:
- 320 →
300
- 890 →
900
- 460 →
500
- 610 →
600
- 550 →
600
- 940 →
900
---
Final Answer:
$$
\boxed{
\text{Part 1: } 30, 70, 50, 90, 50 \\
\text{Part 2: } 300, 900, 500, 600, 600, 900
}
$$
Parent Tip: Review the logic above to help your child master the concept of rounding worksheet for 2nd grade.
