Adam has 20 stickers.
He lacks 10 stickers.
How many stickers does he need altogether?
- 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) What Adam has
(2) What Adam lacks
- Number of stickers that Adam needs altogether = _____
(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) What Adam has
(2) What Adam lacks
10 stickers is less than 20 stickers. So, (2) 'What Adam lacks' gets the shorter bar.
(d)
Number of stickers that Adam needs altogether
= 20 + 10
= 30
Answer(s): a) 1; (b) 2; (c) 2; (d) 30