Adam has 50 marbles.
Bryan has 20 marbles.
How many more marbles does Adam have than Bryan?
- 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) Adam
(2) Bryan
- Number of marbles that Adam has more than Bryan = _____
(a)
Which model should we draw?
(1) Model Part-whole
(2) Model Comparison
We should draw a (2) Model Comparison.
(b)
Is the total given?
(1) Yes
(2) No
(2) The total is not given.
(c)
Who gets the shorter bar?
(1) Adam
(2) Bryan
Adam has 50 marbles but Bryan has 20 marbles.
20 is less than 50. So, (2) Bryan gets the shorter bar.
(d)
Number of marbles that Adam has more than Bryan
= 50 - 20
= 30
Answer(s): (a) 2; (b) 2; (c) 2; (d) 30