Rounding Big Numbers
Aligned to 4.NBT.A.3 — Common Core State Standards for Mathematics.
What this lesson teaches
To round to a place, look at the digit just to the right of that place. If it is 5 or more, round up; if it is 4 or less, keep the digit the same. Then change all digits to the right to zero.
Worked example
Round 3,472 to the nearest hundred. The hundreds digit is 4. Look one spot to the right at the tens digit: 7. Since 7 is 5 or more, round up: the 4 becomes 5, and digits to the right become zero. Answer: 3,500.
Practice questions
- Round 2,846 to the nearest hundred.
- Round 7,318 to the nearest thousand.
- Round 45,672 to the nearest ten thousand.
Watch the lesson
Every lesson comes with a video taught in English and Spanish — the same video the QR code in the printed workbook opens.
▶ Watch this lessonEn español
Redondear numeros grandes
Para redondear a una posicion, mira la cifra que esta justo a la derecha de esa posicion. Si es 5 o mas, redondea hacia arriba; si es 4 o menos, deja la cifra igual. Luego cambia todas las cifras de la derecha a cero.
Ejemplo: Redondea 3,472 a la centena mas cercana. La cifra de las centenas es 4. Mira un lugar a la derecha, en las decenas: 7. Como 7 es 5 o mas, redondea hacia arriba: el 4 se vuelve 5 y las cifras de la derecha se vuelven cero. Respuesta: 3,500.
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