Counting sets of subjects
16 5 days ago
🎯 In this topic you will
- Count sets of objects.
🧠 Key Words
- count
- estimate
- how many
- line
- set
- total
Show Definitions
- count: To determine the number of objects by naming numbers in order.
- estimate: To make a sensible guess about a quantity without counting every item exactly.
- how many: A question used to find the number of objects in a group.
- line: A straight arrangement of objects placed one after another.
- set: A collection of objects considered as a single group.
- total: The final number found after counting all items in a group.
Counting in the Right Order
You need to say the numbers in the correct order to count.
Starting at One
To count objects, start with 1 and say a number for each object.
The Last Number Tells the Total
TThe last number you say tells you how many objects there are.
❓ EXERCISES
$1.$ Count together.
👀 Show answer
The sets show totals of $1$, $2$, $3$, $4$, $5$, $6$, $7$, $8$, $9$, and $10$ objects respectively.
$2.$ Put some objects in the box.
Count your set of objects.
Put your objects in a row. Count again.
👀 Show answer
Answers will vary. The total counted should be the same each time, even after arranging the objects in a row.
$3.$
👀 Show answer
First frame: any $3$ spaces filled. Second frame: any $6$ spaces filled. Third frame: no spaces filled to represent $0$.
❓ EXERCISES
$4.$ Which domino has $5$ spots? Draw a ring around the correct domino.
👀 Show answer
The correct domino is the one that shows exactly $5$ spots (the domino with five dots on one side).
$5.$ Which domino has $9$ spots? Draw a ring around the correct domino.
👀 Show answer
The correct domino is the one that shows exactly $9$ spots (the domino with nine dots on one side).
$6.$ Match each picture to the correct number.
👀 Show answer
Beans match $7$. Cars match $4$. Candies match $8$. The empty set matches $0$. The coloured blocks match $5$. The group of nine objects matches $9$.
$7.$ Draw $7$ bananas. Make it easy to see how many there are.
👀 Show answer
A correct drawing shows any clear arrangement of $7$ bananas, such as a row or grouped set that can be counted easily.
❓ EXERCISES
$8.$ Look at the picture on the previous page. Estimate then count. Write the numbers.
👀 Show answer
Answers will vary for the estimates. Counts from the previous picture are: butterflies $3$, rabbits $5$, frog $4$, tree $2$, birds $6$.
🧠 Think like a Mathematician
Task: Make a poster all about a number.
Instructions:
- Choose a number you want to explore.
- Create a poster that shows different objects that match your chosen number.
- Include drawings or pictures to represent the number in several ways.
- Explain your poster by describing how each group of objects shows the same number.
Follow-up Questions:
1. What number did you choose?
2. How did your pictures help show the number clearly?
3. Did every group on your poster represent the same total?
Show Answers
- 1: Answers will vary depending on the chosen number.
- 2: The pictures show groups of objects that can be counted to match the chosen number.
- 3: Yes, each group should represent the same total so the number is shown consistently.
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