Subtraction is a way to show that some objects are taken away from a group. Young learners can see subtraction by starting with a set of things, removing some, and counting what is left. This matters because it connects numbers to real actions like eating snacks, giving away stickers, or moving toys.
The minus sign tells us that the group is getting smaller.
Key Facts
- Subtraction means taking away from a group.
- The minus sign, -, means subtract or take away.
- The equals sign, =, means the two sides have the same value.
- Subtraction sentence: 8 - 3 = 5.
- Start with the total, take away a part, then count what is left.
- If 6 apples are in a group and 2 are crossed out, 6 - 2 = 4.
Vocabulary
- Subtraction
- Subtraction is the math action of taking some away from a group.
- Minus sign
- The minus sign is the symbol - that tells you to subtract.
- Total
- The total is the number of objects you start with before taking any away.
- Take away
- Take away means to remove some objects from a group.
- Left
- Left means the number of objects that stay after some are taken away.
Common Mistakes to Avoid
- Counting the crossed out objects as the answer is wrong because those are the objects taken away, not the objects left.
- Starting with the smaller number is wrong because subtraction as taking away begins with the whole group first.
- Forgetting to count what remains is wrong because the answer is the number still in the group after taking away.
- Writing the numbers in the wrong order is wrong because 7 - 2 means start with 7 and take away 2, not start with 2 and take away 7.
Practice Questions
- 1 There are 9 balloons. 4 balloons fly away. Write the subtraction sentence and find how many balloons are left.
- 2 A child has 10 crayons. 3 crayons are put in a box. Write the subtraction sentence and find how many crayons are left.
- 3 Look at a group of objects where some are crossed out. Explain why the objects not crossed out show the answer.