Bryan has 70 marbles.
Adam has 20 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 70 marbles but Adam has 20 marbles.
20 is less than 70. So, (2) Adam gets the shorter bar.
(d)
Number of marbles that Adam has less than Bryan
= 70 - 20
= 50
Answer(s): (a) 2; (b) 2; (c) 2; (d) 50