Put Two Groups Together
Count a total when two small groups are joined.
Supplied materials
- A trusted adult to read aloud; paper and pencil are optional.
- Supplied story: two drawn ducks meet three more drawn ducks.
Learn the idea
Adding can join two groups. The first ducks do not disappear when the next ducks arrive. Draw all the ducks, then give each one a counting number. The last number tells how many ducks are together.
Two ducks plus three ducks is written 2 + 3. The plus sign means join these amounts. You can draw a ring around the whole group so you remember to count both parts. An adult can read the signs; you can answer by pointing or speaking.
- Draw two ducks in one group and three in another.
- Draw a large ring around both groups and count each duck once.
- Say the total, then try three ducks with four more ducks.
See the method in action
Two ducks and three ducks make five: 2 + 3 = 5. The count is one, two, three, four, five across both groups.
Check your reasoning
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See the answer and explanation
7 ducks
Both groups count. Three plus four is seven: 3 + 4 = 7. Counting only the new ducks would leave out the first three.
Take it further
Change the new group to two ducks. Three and two now make five: 3 + 2 = 5. Explain which group changed and recount all the ducks.
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