Adam and Bryan have 17 marbles.
Adam has 7 more marbles than Bryan.
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) Adam
(2) Bryan
- 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) Adam
(2) Bryan
Adam has 7 more marbles than Bryan.
So, (2) Bryan gets the shorter bar.
(d)
If 7 marbles are taken away from Adam, Adam and Bryan will have the same number of marbles.
Number of marbles that Bryan has
= (17 - 7) ÷ 2
= 10 ÷ 2
= 5
Answer(s): (a) 2; (b) 1; (c) 2; (d) 5