Grade 4 - Number
Standard 4.N.3 - Solve word problems that have extra or insufficient information.
Included Skills: Mixed Equations
Demonstrate an understanding of addition of numbers with answers to 10 000 and their corresponding subtractions (limited to 3- and 4-digit numerals), concretely, pictorially, and symbolically, by • using personal strategies • using the standard algorithms • estimating sums and differences • solving problems • Model addition and subtraction using concrete materials and visual representations, and record the process symbolically. • Determine the sum of two numbers using a personal strategy (e.g., for 1326 + 548, record 1300 + 500 + 74). • Determine the difference of two numbers using a personal strategy (e.g., for 4127 – 238, record 238 + 2 + 60 + 700 + 3000 + 127 or 4127 – 27 – 100 – 100 – 11). • Model and explain the relationship that exists between an algorithm, place value, and number properties. • Determine the sum and difference using the standard algorithms of vertical addition and subtraction. (Numbers are arranged vertically with corresponding place value digits aligned.) • Describe a situation in which an estimate rather than an exact answer is sufficient. • Estimate sums and differences using different strategies (e.g., front-end estimation and compensation). • Solve problems that involve addition and subtraction of more than 2 numbers. • Refine personal strategies to increase efficiency when appropriate (e.g., 3000 – 2999 should not require the use of an algorithm).