Math Facts
One of the expectations for all third graders
is that they know and are able to recall their basic fact combinations
automatically. This translates to seeing an equation such as 5+3= and
being able to respond "8" within 2 seconds or less. In math, we have
been working on using strategies that are more efficient and less time
consuming than counting on fingers. The group of facts we are currently
focused on is N+9. N can equal any number. Students are learning that
N+9 is equal to N+10, subtract one. It is important that students
cannot only solve these problems but articulate their strategy, as we
will be expanding the strategy to larger numbers. Please practice
adding 9 to any number at home. If your child is struggling, ask what
is ____+ 10 as a cue. If he/she has mastered adding 9, extend the
strategy to 90. N + 90 is the same as N + 100, subtract 10.
6 Rolls to 100
The
students learned a new game today that helps them practice their mental
math and develop their awareness of place value. They enjoyed the game
and asked me to post the directions on the blog.
Materials: 1 die, game board or other recording sheet.
Each
player takes turn rolling the die and recording the roll as either tens
or ones. Each player gets 6 rolls and must use all 6 rolls.
The
object of the game is to get as close to 100 as possible without going
over. The score is calculated by subtracting the total of the rolls
from 100. If you go over 100, your score is 100!
A recording sheet might look like this:
Roll Tens Ones Total
1 5 5
2 3 35
3 6 41
4 3 71
5 4 75
6 1 76
score: 24
We have also tried playing 6 Rolls to 1,000. The rules are the same, we just add a hundreds column.
*Remember when recording your roll you are recording the roll, not the value of the roll.
