Adam has 90 marbles.
Bryan has 30 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 90 marbles but Bryan has 30 marbles.
30 is less than 90. So, (2) Bryan gets the shorter bar.
(d)
Number of marbles that Bryan has less than Adam
= 90 - 30
= 60
Answer(s): (a) 2; (b) 2; (c) 2; (d) 60