Represent a change story using addition and subtraction symbols
I can represent a change story using addition and subtraction symbols.
Represent a change story using addition and subtraction symbols
I can represent a change story using addition and subtraction symbols.
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Lesson details
Key learning points
- A change can be positive or negative.
- A change can be represented by a negative number.
Keywords
Positive change - An overall amount has increased.
Negative change - An overall amount has decreased.
Negative number - Any value less than zero.
Common misconception
Pupils believe that subtraction is commutative and therefore equations can be written in any order.
Model with physical resources such as marbles in a bag that 4 - 6 results in a negative change but 6 - 4 results in a positive change.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Which of the following words is the same as add? Select all that apply.
Q2.The temperature is 32℃. It decreases by 9℃. Tick the symbols that would be needed to write this as an equation.
Q3.The temperature is 12℃. It drops by 11℃. Which of the following unsolved equations matches the problem?
Q4.32 − 17 =
Q5.Which of the following mean 'subtract'?
Q6.Match the word with its correct definition.
one number, calculation or expression is equal to another
the result of subtracting one number from another
finding the total, or sum, by combining two or more numbers
make something different
Assessment exit quiz
6 Questions
Q1.Describe the change.
Q2.Which of the these would result in a negative change to the number of marbles in the bag?
Q3.Jun is adding in and taking out one pound coins from his piggy bank. Which of these would result in a negative difference to the amount of money in the piggy bank?
Q4.People are getting on and off a bus at different stops. The bus already has a number of passengers. Which of these would result in a negative change?
Q5.Jun and Sofia are playing the marbles game. They have used the equation 5 − 7 = −2. What does each of the numbers represent?
the number of marbles added to the bag
the number of marbles taken out of the bag
the change in the number of marbles