Adam needs 80 marbles.
He has 60 marbles.
How many more does he need?
- 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) Has
(2) Needs
- Number of more marbles that Adam needs = _____
(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
(2) The total is not given.
(c)
Who gets the shorter bar?
(1) Has
(2) Needs
60 marbles is less than 80 marbles. So, (1) 'Has' gets the shorter bar.
(d)
Number of more marbles that Adam needs
= 80 - 60
= 20
Answer(s): (a) 1; (b) 2; (c) 1; (d) 20