Unit 2 · Number Theory

Two Rounding Levels — What's the Difference?

Lesson 4 of 18

Premium

About this lesson

4 850 000 rounded to the nearest million = 5 000 000 (the 8 in the hundred-thousands place rounds up). Rounded to the nearest hundred thousand = 4 900 000 (the 5 in the ten-thousands place rounds up). Difference = 100 000.

Chapters

0:00Introduction
0:23The Question
0:56Alinta's Rounding (Nearest Million)
1:25Tau's Rounding (Nearest Hundred Thousand)
1:55Calculating the Final Difference
2:12Exam Strategy — The Midpoint Boundary Rule
2:40Confirming the Final Option

Question

Alinta and Tau both round the number 4 850 000.

Alinta rounds the number to the nearest million.

Tau rounds the number to the nearest hundred thousand.

What is the difference between their answers?

Free account · Selective

Take your Selective prep further

  • Sample questions & worked solutions across core Selective topics
  • Digital exam simulator with interactive practice sets
  • Personalised progress tracking across all your devices
Create free account

Already have an account? Log in here

No payment required. Compare Selective plans

0 of 18 lessons completed

0%
Lesson 3Lesson 5

Give Your Child the Best Chance at Selective Entry

Join NSW families preparing their children for the Selective Schools Placement Test with the most realistic online Selective practice tests available. First tests free—no credit card required.

Claim Your Free Selective Practice Tests