Telling Time, Addition & Subtraction

• Mathematics is a fundamental science that deals with the logic of shape, quantity, and arrangement
• Telling time, addition, subtraction, comparing numbers and solving word problems are all vital math skills
• Proficiency in these areas builds a strong foundation for more advanced mathematical concepts

Telling Time

• Telling time involves understanding how to read and interpret clocks, both analog and digital
• An analog clock has two hands: a shorter hour hand and a longer minute hand
• The hour hand indicates the hour, while the minute hand indicates the minutes
• Each number on the clock represents an hour, and the space between each number represents 5 minutes
• A digital clock displays time using numbers, with the hours and minutes separated by a colon
• Understanding the concept of AM (ante meridiem) and PM (post meridiem) is crucial for specifying the time of day

Two-Digit Addition and Subtraction

• Two-digit addition involves adding numbers with two digits each
• Start by aligning the numbers vertically by place value (ones and tens)
• Add the digits in the ones place first
• If the sum is greater than 9, regroup (carry over) the tens digit to the tens place
• Then, add the digits in the tens place, including any regrouped digit
• Two-digit subtraction involves subtracting numbers with two digits each
• Align the numbers vertically by place value (ones and tens)
• Subtract the digits in the ones place first
• If the top digit in the ones place is smaller than the bottom digit, regroup (borrow) 10 from the tens place
• Then, subtract the digits in the tens place, remembering to account for any borrowed digit

Comparing Numbers Up to 3 Digits

• Comparing numbers involves determining which number is greater than, less than, or equal to another number
• When comparing numbers, start by looking at the digit with the highest place value (hundreds)
• If the digits in the hundreds place are different, the number with the larger digit is the greater number
• If the digits in the hundreds place are the same, move to the next place value (tens) and compare those digits
• If the digits in the tens place are different, the number with the larger digit is the greater number
• If the digits in the tens place are the same, move to the ones place and compare those digits
• Use the greater than (>), less than (<), and equal to (=) symbols to represent the relationship between numbers

Addition and Subtraction Word Problems

• Word problems present mathematical problems in a real-world context
• To solve addition word problems, identify the quantities to be combined and find their total sum
• To solve subtraction word problems, identify the starting quantity, the quantity being taken away, and find the remaining difference
• Read the word problem carefully to understand what is being asked
• Identify the key information and any relevant numbers
• Determine the appropriate operation (addition or subtraction) to use
• Set up the problem and solve it by performing the operation
• Write the answer with the correct units or label
• Check the answer to make sure it makes sense in the context of the problem

Learn to tell time on analog and digital clocks, understanding AM and PM. Master two-digit addition and subtraction with and without regrouping. Solve math word problems with practical examples and step-by-step solutions.