Concept 3 of 8Foundation
Watch on YouTubeVideoComparing, ordering & rounding
To compare large numbers: first count digits. More digits = larger. If tied, compare left-to-right.
Rounding: look at the digit just RIGHT of the rounding place. ≥5 rounds up, <5 rounds down.
Estimation uses rounding to do quick mental math — great for olympiads.
Example
Round 4,876 to nearest 100: tens digit is 7 (≥5) → round up → 4,900.
Estimate 498 × 21 ≈ 500 × 20 = 10,000.
Estimate 498 × 21 ≈ 500 × 20 = 10,000.
💡 Tip:Estimate FIRST to eliminate wrong options fast.
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5 questions to check what you just read.
0 / 5
- Q1.Round 487 to nearest 10:
- Q2.Round 5,472 to nearest 100:
- Q3.Estimate 498 × 21 to nearest 100s:
- Q4.Compare: 8,769 vs 8,796. Which is greater?
- Q5.Round 6,549 to nearest 1,000: