Numeros Completo - Numeros de 2 Digitos

Whole Numbers - 2 Digit Numbers

• Ten is equal to one ten or ten units (ones).
• Twelve is equal to one ten and two units, or ten units and two units.
• Thirteen equals one ten and three units.
• Sixteen equals one ten and six units.
• Nineteen equals one ten and nine units.
• Thirty equals three tens or thirty units.
• Forty equals four tens or forty units.
• Seventy equals seven tens or seventy units
• Ninety equals nine tens or ninety units.
• Twenty equals two tens or twenty units.

Place Value

• Numbers are composed of units (ones) and tens.
• The units digit is the rightmost digit in a number.
• The tens digit is the digit to the left of the units digit.
• Example: In the number 25, 5 is the units digit and 2 is the tens digit.

Expanded Form

• Writing a number as a sum of its place values.
• Example: 58 is equal to 5 tens plus 8 units (50 +8) , or 50 + 8 = 58.

Short Form

• Converting expanded form back to standard form.
• Example: 40 + 3 = 43, two tens plus five units equals 25.

Even and Odd Numbers

• Even numbers end in 0, 2, 4, 6, or 8.
• Odd numbers end in 1, 3, 5, 7, or 9.

Smallest and Largest 2-Digit Numbers

• The smallest two-digit number is 10.
• The largest two-digit number is 99.

Numbers Rounded to Nearest Ten

• Rounding numbers to the nearest ten involves finding the closest multiple of 10.
• Example: 273 rounded to the nearest ten is 270.

Numbers Rounded to Nearest Hundred

• Rounding numbers to the nearest hundred involves finding the closest multiple of 100.
• Example: 183 rounded to the nearest hundred is 200.

Number Sentences

• Use mathematical symbols and operations to express relationships between numbers.
• Example: 5 + 3 = 8.