Add a two-digit and a one-digit number - without regrouping

Learning Objectives Identify the ones and tens places in two-digit numbers. Correctly align two-digit and one-digit numbers for vertical addition. Add the digits in the ones place without regrouping. Add the digits in the tens place, understanding no regrouping is needed. Accurately solve addition problems involving a two-digit and a one-digit number without regrouping. Explain the concept of 'without regrouping' in the context of addition. Ever needed to quickly calculate how many cookies you have if you baked 24 and your friend brought 5 more? 🍪 Let's find out how! In this lesson, you'll learn a simple yet important skill: adding a two-digit number and a one-digit number without needing to carry over. This skill builds a strong foundation for more com...

TermDefinitionExample Two-Digit NumberA whole number that has a digit in the tens place and a digit in the ones place. It ranges from 10 to 99.In the number 37, '3' is in the tens place and '7' is in the ones place. One-Digit NumberA whole number that has only a digit in the ones place. It ranges from 0 to 9.The numbers 2, 5, and 9 are all one-digit numbers. Place ValueThe value of a digit based on its position in a number. For example, in 25, the '2' has a value of 20 because it's in the tens place.In the number 48, the digit '4' has a place value of 40 (4 tens), and the digit '8' has a place value of 8 (8 ones). Ones PlaceThe rightmost position in a whole number, representing individual units.In the number 63, the digit '3&#039...

Place Value Alignment Rule Always align numbers vertically so that digits with the same place value are in the same column. For adding a two-digit number (AB) and a one-digit number (C): `\begin{array}{r} AB \\ + C \\ \hline \end{array}` Before you start adding, make sure the ones digit of the two-digit number is directly above the one-digit number, and the tens digit of the two-digit number is in its own column to the left. This prevents errors in calculation. Add Ones First Rule Start by adding the digits in the ones column: `B + C = D` (where D is the new ones digit). Always begin your addition from the rightmost column, which is the ones place. Add the two digits in this column. Since we are not regrouping, the sum will be 9 or less, and you write this sum directly belo...