Bryan and Adam have 180 marbles.
Bryan has 30 less marbles than Adam.
Find the number of marbles that Bryan has.
- 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 Bryan has = _____
(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
(1) The total is given.
(c)
Who gets the shorter bar?
(1) Bryan
(2) Adam
Bryan has 30 less marbles than Adam.
So, (1) Bryan gets the shorter bar.
(d)
If 30 marbles are taken away from Adam, Bryan and Adam will have the same number of marbles.
Number of marbles that Bryan has
= (180 - 30) ÷ 2
= 150 ÷ 2
= 75
Answer(s): (a) 2; (b) 1; (c) 1; (d) 75