Adam has 100 marbles at first.
Adam gives away 20 marbles.
How many marbles does Adam have in the end?
- Which model should we draw?
(1) Model Part-whole
(2) Model Comparison
- Is the total given?
(1) Yes
(2) No
- Who gets the shorter bar?
(1) At first
(2) Adam gives away
- Number of marbles that Adam has in the end = _____
(a)
Which model should we draw?
(1) Model Part-whole
(2) Model Comparison
We should draw a (1) Model Part-whole.
(b)
Is the total given?
(1) Yes
(2) No
(1) The total is given.
(c)
Who gets the shorter bar?
(1) At first
(2) Adam gives away?
20 marbles is less than 100 marbles. So, (2) 'Adam gives away' gets the shorter bar.
(d)
Number of marbles that Adam has in the end
= 100 - 20
= 80
Answer(s): (a) 1; (b) 1; (c) 2; (d) 80