Add Three Numbers — Three-Part Number Bond (Grade 1)

About this activity

A three-part number bond joins three numbers, like 3, 4, and 5, into one whole, and children add all three and type the total on the keypad. It's a free, interactive Grade 1 math activity that plays right in the browser with no account needed.

Seeing three parts feed one whole shows that you can combine numbers in any order and step by step. Pairs like 4 + 4 + 5 quietly invite making a friendly number first, then adding the last part. The child reads the three parts and types the sum; the dots inside each part are there to count when a fact is not yet automatic.

It is aligned to Common Core 1.OA.A.2 — adding three whole numbers whose total is within 20. No timer, no score — just calm, playful practice.

What's inside this activity

• Designed for Grade 1 learners (ages about 6–7)
• Common Core strand: Operations & Algebraic Thinking
• Aligned to Common Core standard 1.OA.A.2

How to play

Look at the three parts in the number bond, such as 3 + 4 + 5.

Add all three numbers and type the total on the keypad, then press Check.

Not quite? Try again as many times as you like — there is no timer and no score.

What your child practices

• Read three parts of a number bond and see them join into one whole
• Add three one-digit numbers with a total within 20
• Choose a handy order — add the two that make a ten or a friendly number first
• Type the total that names the whole

Learning goals

Add three whole numbers within 20 — the focus of Common Core 1.OA.A.2

See three parts combine into one whole in a number bond

Add in a smart order by making a ten or a friendly number first