Adam has 60 marbles at first.
Adam gives away 30 marbles.
How many marbles are there left?
- 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 left = _____
(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
30 marbles is less than 60 marbles. So, (2) 'Adam gives away' gets the shorter bar.
(d)
Number of marbles left
= 60 - 30
= 30
Answer(s): (a) 1; (b) 1; (c) 2; (d) 30