Bryan has 100 marbles.
Adam has 80 marbles.
How many less 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) Bryan
(2) Adam
- Number of marbles that Adam has less 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) Bryan
(2) Adam
Bryan has 100 marbles but Adam has 80 marbles.
80 is less than 100. So, (2) Adam gets the shorter bar.
(d)
Number of marbles that Adam has less than Bryan
= 100 - 80
= 20
Answer(s): (a) 2; (b) 2; (c) 2; (d) 20