Halve even 2-digit numbers and multiples of 10
I can halve even 2-digit numbers from 12 to 28 and unitise and apply known facts to halve even multiples of 10
Halve even 2-digit numbers and multiples of 10
I can halve even 2-digit numbers from 12 to 28 and unitise and apply known facts to halve even multiples of 10
Lesson details
Key learning points
- Halving facts to 10 can help to halve 2-digit numbers.
- To halve 2-digit numbers, partition the 2-digit number, halve the tens and the ones, then recombine.
Keywords
Double / Doubling - To become twice as many / to multiply by two.
Half / Halving - One of two equal parts of a whole. To divide into two equal parts.
Partition - The act of splitting an object or value down into smaller parts.
Common misconception
Incorrectly partitioning and halving odd multiples of 10
Ensure children use representations where they are able to see the partitioning of the number into an even multiple of 10 and 10 more. That way, they can clearly see they are still finding half of 30 for example.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Use the bar model to complete the sentence. Half of 6 is equal to
Q2.If I know that half of 8 is equal to 4, then I know that _____________
Q3.Which facts are represented by this bar model?
Q4.Which equation is represented by this bar model?
Q5.Alex had 10 marbles. He gave half to Jacob. How many marbles did Jacob get? marbles
Q6.Aisha gave half of her biscuits to Alex. Aisha was left with 7 biscuits. How many biscuits did Aisha have to begin with? biscuits
Assessment exit quiz
6 Questions
Q1.Match the statements.
Half of 6 is equal to 3
Half of 10 is equal to 5
Half of 12 is equal to 6
Half of 8 is equal to 4
Q2.Which facts will help you to find half of 14 by partitioning the parts?
Q3.Match the known facts.
Half of 40 is equal to 20
Half of 20 is equal to 10
Half of 60 is equal to 30
Half of 80 is equal to 40
Q4.How can you find half of 28?
Q5.Look at the image of Base 10 blocks. What is half of 24?
