Adam has 60 marbles.
Bryan has 20 marbles.
How many less marbles does Bryan have than Adam?
- 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 Bryan has less than Adam = _____
(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 60 marbles but Bryan has 20 marbles.
20 is less than 60. So, (2) Bryan gets the shorter bar.
(d)
Number of marbles that Bryan has less than Adam
= 60 - 20
= 40
Answer(s): (a) 2; (b) 2; (c) 2; (d) 40