To solve the problem, we need to estimate the sum of each pair of numbers by rounding each number to the nearest ten and then adding the rounded numbers together. Let's go through each problem step by step.
Problem 1:
Given:
\[
58 + 27
\]
- Round 58 to the nearest ten: \(58 \rightarrow 60\)
- Round 27 to the nearest ten: \(27 \rightarrow 30\)
- Add the rounded numbers: \(60 + 30 = 90\)
Answer:
\[
\boxed{90}
\]
Problem 2:
Given:
\[
45 + 23
\]
- Round 45 to the nearest ten: \(45 \rightarrow 50\)
- Round 23 to the nearest ten: \(23 \rightarrow 20\)
- Add the rounded numbers: \(50 + 20 = 70\)
Answer:
\[
\boxed{70}
\]
Problem 3:
Given:
\[
67 + 32
\]
- Round 67 to the nearest ten: \(67 \rightarrow 70\)
- Round 32 to the nearest ten: \(32 \rightarrow 30\)
- Add the rounded numbers: \(70 + 30 = 100\)
Answer:
\[
\boxed{100}
\]
Problem 4:
Given:
\[
56 + 25
\]
- Round 56 to the nearest ten: \(56 \rightarrow 60\)
- Round 25 to the nearest ten: \(25 \rightarrow 30\)
- Add the rounded numbers: \(60 + 30 = 90\)
Answer:
\[
\boxed{90}
\]
Problem 5:
Given:
\[
76 + 43
\]
- Round 76 to the nearest ten: \(76 \rightarrow 80\)
- Round 43 to the nearest ten: \(43 \rightarrow 40\)
- Add the rounded numbers: \(80 + 40 = 120\)
Answer:
\[
\boxed{120}
\]
Problem 6:
Given:
\[
46 + 23
\]
- Round 46 to the nearest ten: \(46 \rightarrow 50\)
- Round 23 to the nearest ten: \(23 \rightarrow 20\)
- Add the rounded numbers: \(50 + 20 = 70\)
Answer:
\[
\boxed{70}
\]
Problem 7:
Given:
\[
67 + 23
\]
- Round 67 to the nearest ten: \(67 \rightarrow 70\)
- Round 23 to the nearest ten: \(23 \rightarrow 20\)
- Add the rounded numbers: \(70 + 20 = 90\)
Answer:
\[
\boxed{90}
\]
Problem 8:
Given:
\[
65 + 32
\]
- Round 65 to the nearest ten: \(65 \rightarrow 70\)
- Round 32 to the nearest ten: \(32 \rightarrow 30\)
- Add the rounded numbers: \(70 + 30 = 100\)
Answer:
\[
\boxed{100}
\]
Final Answers:
\[
\boxed{70, 100, 90, 120, 70, 90, 100}
\]
Parent Tip: Review the logic above to help your child master the concept of addition estimation worksheet.
