Bryan has 90 marbles at first.
Adam gives him another 20 marbles.
How many marbles does Bryan have in the end?
- 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) At first
(2) Adam gives him
- Number of marbles that Bryan has in the end = _____
(a)
Which model should we draw?
(1) Model Part-whole
(2) Model Comparison
We should draw a (1) Model Part-whole.
(b)
Is the total given?
(1) Yes
(2) No
(1) The total is given.
(c)
Who gets the shorter bar?
(1) At first
(2) Adam gives him
20 marbles is less than 90 marbles. So, (2) 'Adam gives him' gets the shorter bar.
(d)
Number of marbles that Bryan has in the end
= 90 + 20
= 110
Answer(s): (a) 1; (b) 1; (c) 2; (d) 110