Rounding Numbers Flashcards

Grade 4 · Math · Flashcards

Quick-review flashcards for rounding whole numbers.

Flashcards

Rounding rule: If the digit to the right is 5 or more, round up. If it is 4 or less, keep the digit (round down).
Round 56 to nearest ten: 60 (ones digit 6 ≥ 5, round up)
Round 42 to nearest ten: 40 (ones digit 2 < 5, round down)
Round 350 to nearest hundred: 400 (tens digit 5 ≥ 5, round up)
Round 249 to nearest hundred: 200 (tens digit 4 < 5, round down)
Round 1,600 to nearest thousand: 2,000 (hundreds digit 6 ≥ 5, round up)
Round 3,200 to nearest thousand: 3,000 (hundreds digit 2 < 5, round down)
Round 8,500 to nearest thousand: 9,000 (hundreds digit 5 ≥ 5, round up)
Estimate: Use rounding to find a close answer quickly without exact calculation.
What does round down mean?: Keep the target digit the same; replace all digits to its right with zeros.
What does round up mean?: Increase the target digit by 1; replace all digits to its right with zeros.
Round 7,899 to nearest thousand: 8,000 (hundreds digit 8 ≥ 5, round up)