Step-by-step Maths Level 1: Taking away
Part of the Step-by-step Maths Level 1 taking away within 10 chapter. Chapter overview · whole chapter on one page
Taking away
The minus sign (−) means take away.
Cross out the things you take away. Then count what is left. The number left is the answer.
Key ideas
- − means take away.
- Cross out the ones that go.
- Count what is left: that is the answer.
Method. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.5
- Take away 2. Cross out or count back this many.5 - 2
- Write the answer. This is how many are left.3
Check. Add back: 3 + 2 = 5. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.7
- Take away 4. Cross out or count back this many.7 - 4
- Write the answer. This is how many are left.3
Check. Add back: 3 + 4 = 7. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Start with 9. Take away 6 and count what is left.
- Start with 9. There are nine cubes at the start.9
- Take away 6. Cross out six of them.9 - 6 = 3
- Count what is left. Count the cubes that are not crossed out.3
Check. Add back: 3 + 6 = 9. It is right.
Watch out. Count what is left, not what was taken away.
Watch out
Watch out. The answer is what is left, not the number you took away.
Exam tip
Grown-up tip. Use 10 buttons. Take some away and ask: “How many are left? How many did we take away?”
Exercise 7A Taking away
Non-calculatorMethod. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.6
- Take away 1. Cross out or count back this many.6 - 1
- Write the answer. This is how many are left.5
Check. Add back: 5 + 1 = 6. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.9
- Take away 6. Cross out or count back this many.9 - 6
- Write the answer. This is how many are left.3
Check. Add back: 3 + 6 = 9. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.2
- Take away 1. Cross out or count back this many.2 - 1
- Write the answer. This is how many are left.1
Check. Add back: 1 + 1 = 2. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.8
- Take away 6. Cross out or count back this many.8 - 6
- Write the answer. This is how many are left.2
Check. Add back: 2 + 6 = 8. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.10
- Take away 7. Cross out or count back this many.10 - 7
- Write the answer. This is how many are left.3
Check. Add back: 3 + 7 = 10. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.9
- Take away 6. Cross out or count back this many.9 - 6
- Write the answer. This is how many are left.3
Check. Add back: 3 + 6 = 9. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.6
- Take away 2. Cross out or count back this many.6 - 2
- Write the answer. This is how many are left.4
Check. Add back: 4 + 2 = 6. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.2
- Take away 1. Cross out or count back this many.2 - 1
- Write the answer. This is how many are left.1
Check. Add back: 1 + 1 = 2. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.2
- Take away 1. Cross out or count back this many.2 - 1
- Write the answer. This is how many are left.1
Check. Add back: 1 + 1 = 2. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.2
- Take away 1. Cross out or count back this many.2 - 1
- Write the answer. This is how many are left.1
Check. Add back: 1 + 1 = 2. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.2
- Take away 1. Cross out or count back this many.2 - 1
- Write the answer. This is how many are left.1
Check. Add back: 1 + 1 = 2. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.8
- Take away 5. Cross out or count back this many.8 - 5
- Write the answer. This is how many are left.3
Check. Add back: 3 + 5 = 8. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.4
- Take away 2. Cross out or count back this many.4 - 2
- Write the answer. This is how many are left.2
Check. Add back: 2 + 2 = 4. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.3
- Take away 2. Cross out or count back this many.3 - 2
- Write the answer. This is how many are left.1
Check. Add back: 1 + 2 = 3. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Take away the second number from the first. Count back to check.
- Start with the first number. It is the number of things we begin with.2
- Take away 1. Cross out or count back this many.2 - 1
- Write the answer. This is how many are left.1
Check. Add back: 1 + 1 = 2. The answer is right.
Watch out. Count back from the first number, not up from the second.
Method. Count the things that are not crossed out.
- Count the whole group. There are this many to start.8
- Take away the crossed-out ones. Cross out 5 and take them away.8 - 5 = 3
- Count what is left. Count only the ones not crossed out.1, 2, 3
- Write the answer. Accept any answer that counts the ones left.3 are left.
Check. Add back: 3 + 5 = 8. ✓
Watch out. Count only the ones that are not crossed out.