Unit One

Unit Summary: Students use understandings of base-10 place value to develop an understanding of decimals as numbers and develop procedures for adding and subtracting decimals.

Essential Questions:
 How does the base ten number system operate?
 How can numbers be represented to show the value of each digit?
 How does an understanding of place value help compare and order whole numbers and decimals?
 How can estimation help make sense of problems involving addition and subtraction?
 How is the standard algorithm for addition and subtraction similar place value strategies for addition and subtraction?
 How are addition and subtraction of whole numbers similar to addition and subtraction of decimals?
 How can strip diagrams and equations be used to represent addition and subtraction?

Vocabulary:

Place value - valor de posición 

Digit - dígito 

Whole - entero 

Billions - mil millones 

Millions - millones 

Thousands – millares/miles 

Hundreds centenas/cientos 

Tens - decenas 

Ones - unidades 

Decimals - decimales 

Hundredths - centenas 

Tenths - decenas 

Number line- recta numérica 

Position - posición 

One‐tenth - una décima 

Ten times - diez veces 

Expanded notation - forma desarrollada/ forma 

expandida/notación desarrollada 

Numerals - numerales 

Equal to - igual a 

Greater than - mayor que 

Less than - menor que 

Greatest to Least - de mayor a menor 

Least to greatest - de menor a mayor 

Add – sumar, añadir, adicionar 

Subtract – restar, sustraer, deducir 

Sum - suma, importe 

Difference -diferencia 

Estimate- estimar 

Round - redondear 

Compatible numbers - números compatibles 

Nearest 10 – más cercano a la decena 

Nearest 100 - más cercano a la centena 

Nearest 1000 - más cercano al millar 

Equation - oración numérica /ecuación 

Unknown - desconocid