Adding Three Numbers
Aligned to 1.OA.A.2 — Common Core State Standards for Mathematics.
What this lesson teaches
To add three numbers, we add two of them first, then add the last one to that answer.
Worked example
2 + 3 + 4. First add 2 + 3 = 5. Then add 5 + 4 = 9.
Practice questions
- Add 1 + 2 + 3.
- Add 5 + 5 + 2.
- Add 4 + 6 + 4.
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
Sumar tres números
Para sumar tres números, sumamos dos de ellos primero y luego le sumamos el último a esa respuesta.
Ejemplo: 2 + 3 + 4. Primero suma 2 + 3 = 5. Luego suma 5 + 4 = 9.
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