Estimate the sum of two whole numbers whose sum is 99 or less and recognize whether the estimation is reasonable (e.g., 27 + 41 is about 70, because 27 is about 30 and 41 is about 40, and 30 + 40 is 70). (a)
- Computation and Estimation
The student will a) estimate sums and differences; b) determine sums and differences, using various methods; and c) create and solve single-step and two-step practical problems involving addition and subtraction.
The student will use problem solving, mathematical communication, mathematical reasoning, connections, and representations to