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Number, Fractions and Money
Objectives
To find \frac{1}{2}, \frac{1}{3}, \frac{1}{4} and \frac{3}{4} of amounts using sharing and number facts.
Resources
Abacus Workbook 1 | Hit the Button (TopMarks) | 📄 Rice Crispies Cake Recipe | 16 counters | Assignment 10
Vocabulary
fractions | halves | quarters | thirds
Today's Lesson
Assignment
This lesson works towards Assignment 10. Please access the assignment for details about what you will need to submit to your Wolsey Hall tutor.
Consolidate
Before you start the lesson, watch this Recap Video with your student.
Practise either recall of doubles or 2, 5, and 10 times tables on Hit the Button.
PRACTISE - Hit the Button (TopMarks)
Introduction
With your student, read through the 📄 Rice Crispies Cake Recipe. Look at the ingredients list and explain that this recipe would make more cakes than we need and that you would like to halve the amounts.
Give your student time to think and discuss with you how much of each ingredient would be needed if the recipe was halved.
Agree that we can use our number facts to halve 12, so 6 tablespoons of butter would be needed.
Model sharing out 16 counters (or actual cups if available) into 2 groups to find half of 16 is 8 (your student may also be able to use number facts to halve 16 cups of marshmallows).
Repeat the sharing for 24, finding that you will need 12 cups of Rice Crispies now. Model the partitioning strategy for halving 24: partition into 20 + 4 and then use number facts to find halves before recombining.
Record the new amounts in the Ingredients Table in Part A of Assignment 10.
Now suggest that we want a chewier version using the same amount of marshmallows, but\frac{1}{3} of the Rice Crispies and \frac{1}{3} of the butter. Ask your student how they could find \frac{1}{3}. Demonstrate finding \frac{1}{3} by sharing the 24 cups three ways. Ask your student to think and then discuss with you how much butter we would need if we used only \frac{1}{3}. Record this in the Ingredients Table. (The marshmallows box is blocked out because we are not changing this amount.)
Finally, explain that you also want to create a recipe that is a quarter of the original in order to make bitesize portions. Demonstrate how we find \frac{1}{4} by halving and halving again. Your student should then record the new amounts in the Ingredients Table.
Main Activity
Give your student the Chocolate Cornflake Cake recipe from Part B of Assignment 10. Explain that this recipe would make far too much, and we only want to make \frac{1}{4} of the amount.
Remind that to find \frac{1}{4} of an amount, you can halve and halve again.
Ask:
- How could you use the amount column on the Ingredients Table to help find
\frac{1}{4}?
Complete the table for \frac{1}{4}?scale=1 of the amount.
Ask your student to work out the amount of each ingredient needed to make \frac{1}{2}?scale=1of the recipe and complete the column in the table.
They should then come up with a chocolatey version by finding \frac{1}{3}?scale=1 of all ingredients (apart from the chocolate which will stay as it is and is blocked out on the table) and record the amounts in the Ingredients Table.
Once Assignment 10 is completed, please submit to your Wolsey Hall tutor.
Workbook
To help your student recap upon previous learning from this course, please ask them to complete the activities on page 63 of Abacus Workbook 1.