Question
Adam has 80 marbles at first.
Adam gives Bryan some.
Now, Adam has 50 marbles.
How many marbles does Adam give to Bryan?

  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) Has at first
    (2) Has now
  4. Number of marbles that Adam gives to Bryan = _____
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 80 marbles at first.
Adam gives Bryan some.
Now, Adam has 50 marbles.
How many marbles does Adam give to Bryan?

  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) Has at first
    (2) Has now
  4. Number of marbles that Adam gives to Bryan = _____