Explain how to balance equations with subtraction expressions
I can explain how to balance equations with subtraction expressions.
- Year 6
Explain how to balance equations with subtraction expressions
I can explain how to balance equations with subtraction expressions.
Lesson details
Key learning points
- If the minuend and subtrahend are changed by the same amount, the difference stays the same.
- If you increase or decrease the minuend, the difference increases or decreases by the same amount.
- If you increase the subtrahend then the difference decreases.
- If you decrease the subtrahend then the difference increases.
Keywords
Unknown - An unknown is a quantity that has a set value but it is represented by a symbol or letter.
Equation - An equation is used to show that one number, calculation or expression is equal to another.
Expression - An expression contains one or more values, where each value is separated by an operator.
Common misconception
Pupils immediately calculate expressions instead of considering the relationship between expressions.
Take time to model interrogation of values within expressions, identifying relationships between them. Encourage this reasoning and show how it can be more efficient than calculation especially in situations with larger values.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Which of the following expressions has the same sum as 306 + 30? Can you reason without calculating?
Q2.Round 23,654 to the nearest multiple of 10
Q3.Use an efficient strategy to calculate 56.75 + 22.25 =
Q4.Use the correct inequality symbol to make this correct: 349,207 349,086
Q5.Use rounding, estimating, comparing or reasoning to determine the missing symbol in this inequality statement. 36 + 23 23 + 47
Q6.Use an efficient strategy to calculate 10,000 − 8,655 =
Assessment exit quiz
6 Questions
Q1.Select the correct symbol to compare the expressions. 40.36 − 21.63 ___ 39.86 − 27.91
Q2.Select the correct symbol to compare the expressions. 12,453 − 6,104 ___ 27,896 − 19,317
Q3.The unknown subtrahend in the diagram below is
