Addition and Subtraction Mental strategies – compensation strategy with decimals Follow these steps for the compensa on strategy when adding decimals: 1 Round the number closest to a whole number. 2 Compensate for rounding: 31.4 + 5.8 31.4 + 6 I rounded up by 0.2, 51.4 + 8.3 51.4 + 8 ...
SubtractionAccuracyThis paper reports on a study of two children's mental computation in addition and subtraction, and compares their mental architecture. Both students were identified as being accurate, however, one student used a variety of mental strategies (was flexible) while the other student ...
Mental Math Mental math is about performing math calculations in your head without a calculator or paper. This is a good skill to have because in some math tests, you have to work out the problems without the use of a calculator. Being able to solve addition and subtraction problems without...
Subtraction- Errors • Confusion between subtraction and addition –Pre-operational behavior • Strategies –Give students a variety of subtraction problems –Tasks that include open number sentences • 17 + ___ = 35 • 35 - ___ - 17 ...
Apply properties of operations as strategies to add and subtract. Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Add within 100, including adding a two-digit number and a one-digit number. Fluently add and subtract within 20 using mental strategies. More...
内容提示: Grade: 2nd Grade Unit 2: Addition and Subtraction (within 20) Length of Unit: 2 weeks Included Standards: MACC.2.OA.1.1, MACC.2.OA.2.2, MACC.2.OA.3.3 Score 4.0 In addition to Score 3.0, in-depth inferences and applications that go beyond what was taught. The student...
Numbers - Mental addition and subtraction game - Game the 14 closest items in Pearltrees Come on in! Join Pearltrees, it's quick and it's free Join Pearltrees Log in Numbers - Mental addition and subtraction game - Game Algebra Meltdown XtraMath Radical Math cell phone ...
Mental Math: Multiplication and Division Mental Math: Addition and Subtraction Start today. Try it now Math for Kids 23 chapters | 325 lessons Ch 1. Numbers for Elementary School Ch 2. Geometry for Elementary School Ch 3. Fractions for Elementary School Ch 4. Math Basics for Elementary...
Mental Math - practice adding numbers Common Core Connection for Grades 1 and 2 Apply properties of operations as strategies to add and subtract. Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Add within 100, including adding a two-digit number and a ...
Master addition and subtraction within 100 with this interactive math lesson. Discover the power of place value and develop essential problem-solving skills. 3 VIEW DETAILS Add With Pictures Add using Number Bonds within 5 Strengthen addition skills by learning to create and solve simple addition sen...