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Level One > Number and Algebra

# You Be The Teacher

Achievement Objectives:

Specific Learning Outcomes:

Use their mathematical knowledge to invent basic addition and subtraction problems;

Solve other students’s problems.

Devise and use problem solving strategies to explore situations mathematically.

Description of mathematics:

This problem is one that should not be used until the students have become confident in handling some areas of mathematics. To be able to make up a problem requires a deeper understanding of the problem than just being able to solve it. Hence this problem will give you a means of assessing a student’s knowledge of the recent maths that they have done.

It is likely that students who haven’t been given an exercise like this before will do no better than produce a sum such as 2 + 3 = 5, where 5 is the answer required. There are two directions that you can work from here. The first is to see what other sums they can make. This gives them the opportunity to explore the number 5 and it helps to cement their basic number facts. The second direction is to get them to embed the sum in a story. So you could ask them to put the problem into an actual situation with, say, cakes or money.

Mathematically weaker students may need to be prompted to help them produce a sum. You may need to recall for them what sums they have done so far. Try to lead them on to word problems. They will probably only be able to mimic these problems. But even that is a start towards deeper learning.

The more able students might be extended to problems that need more than one step or might be challenged to produce a problem with an answer such as ‘Mary’.

This open problem allows the students to use their imagination. It should give them the chance to invent some interesting word problems and to put the mathematics that they have learned so far together in creative ways.

You might like to note that this is the first of a series of similar problems that span from Level 1 to Level 6. These problems are Make Up Your Own, Level 2, Invent-A-Problem, Level 3, Create a Question, Level 4, Cart Before The Horse, Level 5 and Working Backwards, Level 5. You might like to flip through these problems to see how they develop over the Levels. It’s possible that you will be able to use some of the ideas from the later Levels.

Required Resource Materials:
Envelopes
Copymasters for the sealed envelopes (English)
Copymasters for the sealed envelopes (Māori)
Activity:

### The Problem

The teacher has some sealed envelopes. Make up a problem. Your answer should be the number you find in the envelope.

### Teaching Sequence

There are several ways to approach this problem. If you think that this problem can be tackled easily by many of your class, then adopt Method A. This way you give little in the way of hints to the class as a whole. However, you may need to help some of them individually.

Method B is for a class that needs more help and it begins with a short session on the mat to remind the class of some of the things that they have done so far.

Method A: Start with all the students together on the mat.

Tell them that today they are going to be the teacher and make up some maths problems. There is only one restriction. That is, the answer has to be the one you are going to give them in a sealed envelope. The problems that they make up can be anything they like.

1. Let the students work on the problem together or on their own. Help the ones who are having trouble. Those students who finish quickly could be asked to make up another problem using another envelope.
2. When a student has finished a problem put the problem into a sealed envelope. When you have collected enough problems the envelopes could be given to other students to solve either straight away or later on.

Method B: Start with all the students together on the mat.

1. Tell them that you would like them to make up some problems of their own today. So, in a way, they will be the teacher. Ask them what problems they can remember working on.
2. Ask the students to give you a number. Then try to get them to make up a sum using that number as the answer.
3. Then see if they can use the sum in a word problem.
4. Now say that you have some answers in sealed envelopes. You want them to make up a problem that has that number as the answer.
5. Let them work singly or in groups to come up with some problems of their own. If they can only produce a sum rather than a problem then you could get them to find other sums that make up that same number or you could help them to produce a word problem.
6. You may need to write down their questions for them. These problems could also go into an envelope for later use.
7. Those students who finish quickly might like to try to write another problem or solve someone else’s problem.
8. On the mat, pose some of the students' problems that they have put into sealed envelopes, for the class to solve.
9. You might like to keep some of these problems to use with the class over the next few weeks.

### Solution

The solutions here will depend on your class.

AttachmentSize
YouBeTheTeacher.pdf28.08 KB
YouBeTheTeacherMaori.pdf14.23 KB

## The Rock Pool

Find strategies for investigating number problems.

## Little Magic Squares

Recall addition facts

Know the idea of, and be able to construct, magic squares.

## Make Up Your Own

Use their mathematical knowledge to invent problems;

Solve other students' problems.

Devise and use problem solving strategies to explore situations mathematically.

## More Lollies

Solve problems up to 20 using subtraction and addition.

## Gremlins

Model and explain addition facts to 10 and then 20.

Model and explain subtraction facts to 10 and then 20.

Devise and use problem solving strategies (act, draw)