What we know: Griffin started off with 52 balloons, he let go of 29 balloons
What we need to find out: how many balloons Griffin has left
What we notice: the subtrahend is very close to a landmark, the difference is missing, the answer will be less than 52
Model: open number line
Strategies: splitting & jumping to, from or by a landmark number
Courtesy of Cassius, this week’s DJ!
What we know: Gavin had 36 books, Harriett gave him 45 more
What we need to figure out: how many books Gavin has now
what we notice: the sum is missing, the sum will end in a 2 because 7+5=12, both addends are not landmarks
model: open number line
strategies: splitting & jumping to, from or by a landmark number
about today’s read aloud The Other Side
about today’s read aloud!