Question
Bryan has 100 marbles at first.
Bryan gives Adam some.
Now, Bryan has 80 marbles.
How many marbles does Bryan give to Adam?

  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 Bryan gives to Adam = _____
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

Bryan has 100 marbles at first.
Bryan gives Adam some.
Now, Bryan has 80 marbles.
How many marbles does Bryan give to Adam?

  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 Bryan gives to Adam = _____