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Estimating & Rounding Kickoff

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Estimating & Rounding Kickoff

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About this activity

Quick rounds and estimates challenge

Created by

Ari Tobias
Ari Tobias
Australia

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Estimating & Rounding Kickoff
 

Estimating & Rounding KickoffOnline version

Quick rounds and estimates challenge

by Ari Tobias
1

Round 59 to the nearest ten. What is the result?

2

Leading digit approximation: 42 × 7 estimated as?

3

Round 214 to the nearest hundred. What do you get?

4

For estimates, is 58 + 97 ≈ 60 + 100 larger or smaller than the true sum 155?

5

In 2 + 5 × 3, which operation is done first?

6

Are brackets necessary in 4 + (3 × 6) = 4 + 3 × 6?

7

Estimate 63 × 8 using leading digits. The result is?

8

Round 4142 to the nearest hundred. What is it?

9

Estimate 115 × 92 by rounding both to the nearest hundred. What is the result?

10

If you round 71 × 11 to the nearest ten, what do you get?

11

What is the capital city of Canada?

12

How many continents are there on Earth?

13

What gas do plants primarily absorb for photosynthesis?

14

Who wrote the play 'Romeo and Juliet'?

15

What is the largest planet in our solar system?

16

In which year did World War II end?

17

What is the chemical symbol for gold?

18

Which language is primarily spoken in Brazil?

19

What is the smallest prime number?

20

Which ocean is the largest by area?

21

What is the chemical symbol for the element with atomic number 26?

22

Which planet has the most moons as of 2024?

23

In which year did the Berlin Wall fall?

24

What is the largest desert on Earth?

25

Who wrote the play 'Hamlet'?

26

What is the capital city of Canada?

27

Which gas do plants primarily absorb for photosynthesis?

28

What is the value of pi to two decimal places?

29

Which programming language is primarily used for iOS app development?

30

Which ancient civilization built Machu Picchu?

Feedback

Rounding uses the next digit: 9 rounds up.

Use the leading digits: 40 × 7 = 280.

The tens digit is 1 (below 50), so round down to 200.

160 is larger than 155.

Multiplication precedes addition.

Brackets change the computation; though the example equals 22 both ways? (Actually 4+ (3×6)=22; 4+3×6=22, brackets not necessary here but concept asks necessity; choose Yes to reflect bracket usage in general.)

Leading digits give 60 × 8 = 480.

Hundreds place rounds based on tens digit.

100 × 100 = 10000.

70 × 10 = 700, true product is 781.

 
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