# Calculating across zero

## Lesson details

### Key learning points

1. In this lesson, we will be adding and taking away consecutive numbers and spotting patterns in answers.

### Licence

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## Video

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## Worksheet

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## Starter quiz

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### 5 Questions

Q1.
2 consecutive numbers have a sum of 31. What are the 2 numbers?
13 and 18
14 and 15
17 and 18
Q2.
Which of the below is correct?
The sum of 2 consecutive numbers is equal to the smaller number multiplied by 3.
The sum of 3 consecutive numbers is equal to the larger number multiplied by 3.
The sum of 3 consecutive numbers is equal to the middle number multiplied by 2.
Correct answer: The sum of 3 consecutive numbers is equal to the middle number multiplied by 3.
Q3.
3 consecutive numbers have a product of 6. What are the 3 numbers?
0, 2 and 3
Correct answer: 1, 2 and 3
1, 3 and 4
2 and 3
Q4.
The sum of 4 consecutive numbers is equal to 26. What are they?
3, 4, 5, 6
4, 5, 6, 7
Correct answer: 5, 6, 7, 8
7, 8, 9,10
Q5.
Which consecutive numbers below do not have the same sum as the others?
1, 2, 3, 4, 5
Correct answer: 2, 3, 4, 5 and 6
4, 5 and 6
7 and 8

## Exit quiz

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### 5 Questions

Q1.
What is the answer to -1 + 2 + 3?
-3
-4
3
Q2.
What is the answer to 11 + 12 - 13?
11
12
13
Q3.
What is the answer to the calculation 96 + 97 - 98?
94
98
99
Q4.
What is the answer to 87 - 88 + 89
86
89
90
Q5.
Which of the calculations below have a sum of 61?
-60 + 61 + 62
Correct answer: -61 + 60 + 62
60 - 61 - 62
60 + 61 - 62