Question
Adam has 20 marbles at first.
Adam gives away 10 marbles.
How many marbles are there left?

  1. Which model should we draw?
    (1) Model Part-whole
    (2) Model Comparison
  2. Is the total given?
    (1) Yes
    (2) No
  3. Who gets the shorter bar?
    (1) At first
    (2) Adam gives away
  4. Number of marbles left = _____
4 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

(c)

Click button first when a symbol is required. X

(d)

Click button first when a symbol is required. X

Adam has 20 marbles at first.
Adam gives away 10 marbles.
How many marbles are there left?

  1. Which model should we draw?
    (1) Model Part-whole
    (2) Model Comparison
  2. Is the total given?
    (1) Yes
    (2) No
  3. Who gets the shorter bar?
    (1) At first
    (2) Adam gives away
  4. Number of marbles left = _____