– solve problems involving the addition and
subtraction of two-digit numbers, using
a variety of mental strategies (e.g., to add
37 + 26, add the tens, add the ones, then
combine the tens and ones, like this:
30 + 20 = 50, 7 + 6 = 13, 50 + 13 = 63);
– add and subtract three-digit numbers,
using concrete materials, studentgenerated
algorithms, and standard
algorithms;
– use estimation when solving problems
involving addition and subtraction, to help
judge the reasonableness of a solution;
– add and subtract money amounts, using a
variety of tools (e.g., currency manipulatives,
drawings), to make simulated purchases
and change for amounts up to $10
(Sample problem:You spent 5 dollars and
75 cents on one item and 10 cents on
another item. How much did you spend
in total?);
– relate multiplication of one-digit numbers
and division by one-digit divisors to reallife
situations, using a variety of tools and
strategies (e.g., place objects in equal
groups, use arrays,write repeated addition
or subtraction sentences) (Sample problem:
Give a real-life example of when you
might need to know that 3 groups of 2 is
3 x 2.);
– multiply to 7 x 7 and divide to 49 ÷ 7,
using a variety of mental strategies (e.g.,
doubles, doubles plus another set, skip
counting).