Chapter 5- Model Two-Digit Addition
Summary
5-1 Add Tens: I can use mental math and basic facts to add tens.
5-2 Count On Tens and Ones: I can count on by tens and ones to add.
5-3 PSS: Work Backward: I can use the work backward strategy to solve problems
5-4 Regroup Ones as Tens: I can regroup 10 ones as 1 ten.
Vocabulary: Regroup: to take apart a number to write it in a new way.
5-5 Add One-Digit Numbers and Two-Digit Numbers: I can add one-digit numbers to two-digit numbers with and without regrouping.
5-6 Add Two-Digit Number: I can add two-digit numbers with and without regrouping.
5-7 Estimate Sums: I can estimate the sum of two-digit addends by rounding.
Rounding hundreds chart.
Helps show to round up or down.
Vocabulary: Round: to change the value of a number to one that is easier to work with.
5-8 Add Three Two-Digit Numbers: I can add three two digit numbers.
5-9 PSS: Choose a Strategy: I can choose the best strategy to solve problems.