Counting On
Aligned to 1.OA.C.5 — Common Core State Standards for Mathematics.
What this lesson teaches
To add a small number, we can start at the bigger number and count up.
Worked examples
Example 1
6 + 3. Start at 6, then count up 3: 7, 8, 9. So 6 + 3 = 9.
Example 2
4 + 2. Start at the bigger number, 4, and count up 2: 5, 6. So 4 + 2 = 6.
Example 3
Counting on works best when one number is small. For 9 + 8 it is faster to make a ten than to count up eight times.
Practice questions
- Solve 7 + 2 by counting on.
- Solve 5 + 3 by counting on.
- Start at 8 and count on 2. What number do you land on?
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
Contar hacia adelante
Para sumar un número pequeño, podemos empezar en el número más grande y contar hacia adelante.
Ejemplo 1: 6 + 3. Empieza en 6, luego cuenta 3 más: 7, 8, 9. Así que 6 + 3 = 9.
Ejemplo 2: 4 + 2. Empieza en el número mayor, 4, y cuenta 2 más: 5, 6. Así que 4 + 2 = 6.
Ejemplo 3: Contar hacia adelante funciona mejor cuando un número es pequeño. Para 9 + 8 es más rápido formar una decena que contar ocho veces.
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