Grade 3 - Number Sense and Numeration
Standard 3.NSN.3 - Practice solving addition sentences up to 1000.
Included Skills: Addition
Operational Sense • 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, student-generated 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 real-life 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).