Grade 3 - The Number System
Standard 3.NS.1.10 - Use properties of addition to find the missing number of an equation.
Included Skills: Number Properties, Addition
Students will be expected to apply mental mathematics strategies and number properties to develop quick recall of basic addition facts to 18 and related basic subtraction facts. • Performance Indicators - N10.01 Describe a mental mathematics strategy that could be used to determine a given basic addition fact up to 9 + 9. - N10.02 Explain how the commutative (order-doesn’t-matter) property and the identity (no-changewith-zero) property can assist in addition fact learning. - N10.03 Describe a mental mathematics strategy that could be used to determine a given basic subtraction fact with minuends up to 18 and subtrahends up to 9. - N10.04 Recognize which facts could be determined by a given strategy. - N10.05 Quickly recall basic addition facts to 18 and related subtraction facts in a variety of contexts