Year 6

# Extending calculation strategies and additive reasoning

## Lessons (30)

• In this lesson, we will be adjusting addends to make a calculation easier, keeping the sum the same.
1 Video
• In this lesson, we will be extending the 'same sum' strategy to the addition of larger numbers.
1 Video
• In this lesson, we will be extending the 'same sum' strategy to calculations with decimal fractions.
1 Video
• In this lesson, we will be extending the 'same sum' rule to balance equations.
1 Video
• In this lesson, we will be balancing equations using the compensation property of addition and subtraction.
1 Video
• In this lesson, we will be balancing equations and noticing that the order of the addends is not important.
1 Video
• In this lesson, we will notice that, if an addend is increased and the other is kept the same, the sum increases by the same amount.
1 Video
• In this lesson, we will notice that, if one addend is decreased and the other is kept the same, the sum decreases by the same amount
1 Video
• In this lesson will be solving calculations mentally by relating them to known facts.
1 Video
• In this lesson, we will be finding an unknown addend when the sum is changed.
1 Video
• In this lesson, we will learn about the 'same difference' strategy.
1 Video
• In this lesson, we will learn about contexts which focus on where the difference is kept the same.
1 Video
• In this lesson, we will use the some of the language of subtraction used in previous lessons- minuend, subtrahend and difference.
1 Video
• In this lesson, we will transform subtraction calculations by using the "same difference" method. This method involves shifting numbers whilst preserving the answer, but making the calculation easier.
1 Video
• In this lesson, we will practise transforming calculations to make them easier to solve mentally
1 Video
• In this lesson, we will transform a subtraction calculation between two five digit numbers to make the written algorithm easier to apply.
1 Video
• In tthis lesson, we will practise the 'same difference' in different contexts. We will learn that transforming written calculations makes it easier to solve them using a written method.
1 Video
• In this lesson, we will learn to balance equations to find unknown values. We will learn how the image of a see-saw helps us think about equivalent calculations, if they are level, they are equal (equivalent) to each other.
1 Video
• In this lesson, we will explore how the difference changes when only the minuend is changed.
1 Video
• In this lesson, we will apply the generalisation about how the minuend and difference change to solve problems.
1 Video