1. Click here to develop your problem solving understanding and capacity!

2. Touch the part of the problem that is asking you to find something out.
Mary and Joan are collecting cans for charity.
Altogether they have collected 28 cans.
Mary has collected 16 cans.
How many cans did Joan collect?
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3. What is the problem asking you to find out?
Mary and Joan are collecting cans for charity.
Altogether they have collected 28 cans.
Mary has collected 16 cans.
How many cans did Joan collect?
How many cans Joan drank.
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How many cans Joan gave away.
How many cans Joan collected.

4. What information will you look for?
Mary and Joan are collecting cans for charity.
Altogether they have collected 28 cans.
Mary has collected 16 cans.
How many cans did Joan collect?
A number of cans
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Joan
How many cans Joan collected.

5. Touch where you see Joan.
Mary and Joan are collecting cans for charity.
Altogether they have collected 28 cans.
Mary has collected 16 cans.
How many cans did Joan collect?
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6. Touch where you see Joan.
Touch where you see a number of cans.
Mary and Joan are collecting cans for charity.
Altogether they have collected 28 cans.
Mary has collected 16 cans.
How many cans did Joan collect?
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7. Touch who else collected cans.
Mary and Joan are collecting cans for charity.
Altogether they have collected 28 cans.
Mary has collected 16 cans.
How many cans did Joan collect?
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8. Touch who else collected cans.
Touch the number of cans Mary collected.
Mary and Joan are collecting cans for charity.
Altogether they have collected 28 cans.
Mary has collected 16 cans.
How many cans did Joan collect?
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9. Touch the number of cans Mary and Joan collected altogether.
Mary and Joan are collecting cans for charity.
Altogether they have collected 28 cans.
Mary has collected 16 cans.
How many cans did Joan collect?
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10. Touch the strategy we could use.
Mary and Joan are collecting cans for charity.
Altogether they have collected 28 cans.
Mary has collected 16 cans.
How many cans did Joan collect?
28 cans – 16 cans = ___ cans
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16 cans + ___ cans = 28 cans
28 cans - ___ cans = 16 cans

11. Let’s check we have found out!
Mary and Joan are collecting cans for charity.
Altogether they have collected 28 cans.
Mary has collected 16 cans.
How many cans did Joan collect?
12 cans
28 cans – 16 cans = ___ cans 12
16 cans + ___ cans = 28 cans 12
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28 cans - ___ cans = 16 cans 12

12. Now use the problem solving steps to investigate this problem!
Mary and Joan are collecting cans for charity.
Altogether they have collected 26 cans.
Mary has collected 11 cans.
How many cans did Joan collect?