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MNM-3.2.1.3T Estimating sums and differences

[TESTS]

Multiple Choice Qs Practice
[MNM-3.2.1.3T MCQs]
Question 1 of 10

Choose the best estimate for the given problem.

Estimate the sum of 42 and 37 by rounding each number to the nearest ten.




✓ Correct! That’s correct! 42 rounds to 40, and 37 rounds to 40. Adding these estimates gives 40 + 40 = 80.
✗ Incorrect. Not quite. Remember to round each number to the nearest ten first, then add. Think about which multiple of ten each number is closest to.

Quiz Complete!

You scored: 0 / 10

True or False Qs Practice
[MNM-3.2.1.3T TFQs]
Question 1 of 10

State whether the following statement is True or False.

The estimated sum of 28 + 43, rounded to the nearest ten, is 70.


✓ Correct! That’s right! 28 rounds to 30, and 43 rounds to 40. 30 + 40 = 70. So the statement is ‘True’.
✗ Incorrect. Remember to round each number to the nearest ten before adding. Check your rounding for 28 and 43.

Quiz Complete!

You scored: 0 / 10

True or False with Reason Qs Practice
[MNM-3.2.1.3T TFQRs]
Question 1 of 10

Read the statement and its reason carefully. Choose the option that correctly describes the statement.

The estimated sum of 34 + 58, rounded to the nearest ten, is 90. Is this true?




✓ Correct! Excellent! You correctly rounded both numbers and found their estimated sum. 34 is closer to 30, and 58 is closer to 60. Their sum is 90.
✗ Incorrect. Review the rounding rules for both 34 and 58 to the nearest ten. Then, calculate their sum.

Quiz Complete!

You scored: 0 / 10

Matching Question Practices
[MNM-3.2.1.3T MQs]

Select an item from Column A, then select its match in Column B.

COLUMN-A
Estimate 31 + 48
✓ Correct Match:
80
Estimate 67 – 22
✓ Correct Match:
50
Estimate 12 + 89
✓ Correct Match:
100
Estimate 93 – 48
✓ Correct Match:
40
Estimate 170 + 230
✓ Correct Match:
400
Estimate 580 – 110
✓ Correct Match:
500
Rounding 65 to the nearest ten
✓ Correct Match:
70
Estimating sum of 22 + 39 (nearest ten)
✓ Correct Match:
60
Meaning of ‘about how many’
✓ Correct Match:
Estimate
Rounding 450 to the nearest hundred
✓ Correct Match:
500
COLUMN-B
80
Estimate
500
60
50
500
100
40
400
70
✓ Perfect Match! All pairings are correct.
✗ Incorrect Pairings. Check review answers.

Quiz Complete!

You scored: 0 / 10

Fill Blank Qs Practices
[MNM-3.2.1.3T FBQs]
Question 1 of 10

Complete the sentence with the correct word or number.

To estimate the sum of 41 and 28, you would round 41 to 40 and 28 to — Select —90tens60030reasonableestimateround down4070.

✓ Correct! Correct! 28 is closer to 30 than to 20 when rounding to the nearest ten.
✗ Incorrect. Which multiple of ten is 28 closest to?

Quiz Complete!

You scored: 0 / 10

Numerical Exercise Qs Practices (Set-1)
[MNM-3.2.1.3T NEQs1]
Question 1 of 8

Estimate the sum by rounding each number to the nearest ten.

34 + 57 — Select —3040070500504090

✓ Correct! Great job! 34 rounds to 30, and 57 rounds to 60. 30 + 60 = 90.
✗ Incorrect. Round 34 and 57 to the nearest ten, then add the rounded numbers.

Quiz Complete!

You scored: 0 / 8

Numerical Exercise Qs Practices (Set-2)
[MNM-3.2.1.3T NEQs2]
Question 1 of 9

Estimate the sum by rounding each number to the nearest hundred.

375 + 120 — Select —50080409020800600300

✓ Correct! Excellent! 375 rounds to 400, and 120 rounds to 100. 400 + 100 = 500.
✗ Incorrect. Remember to look at the tens digit when rounding to the nearest hundred for both numbers.

Quiz Complete!

You scored: 0 / 9

Numerical Exercise Qs Practices (Set-3)
[MNM-3.2.1.3T NEQs3]
Question 1 of 9

Estimate the difference by rounding each number to the nearest hundred.

850 – 410 — Select —401008005006040050

✓ Correct! Correct! 850 rounds to 900, and 410 rounds to 400. 900 – 400 = 500.
✗ Incorrect. Remember to round 850 up to the nearest hundred. Then, round 410 and subtract.

Quiz Complete!

You scored: 0 / 9