How to Convert a Start and Stop Time into a Time Interval - Elapsed Time - Free Worksheet

 

Summary:

This video teaches how to calculate time intervals between a start time and an end time. It explains a step-by-step method:

Subtract the start time from the end time.

Subtract the hours.

Compare the minutes:

If the start minutes are less than or equal to the end minutes, subtract normally.

If the start minutes are greater, subtract 1 from the hour total, add 60 minutes to the end minutes, then subtract the start minutes.

Several examples are worked through, including:

Time intervals within the same a.m. or p.m. period.

A more challenging bonus example involving a time span from a.m. to p.m., which requires converting the p.m. time to 24-hour format by adding 12 to the hour.

Key takeaway: Always break time interval problems into manageable steps, and adjust for minute and a.m./p.m. differences when needed.

You may enjoy thisworksheet that compliments the video.

Free Time Intervals Worksheet

Time Intervals Answewr Key

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Money Word Problems - Multi-step Problems - Free Worksheet and Summary

 

In this video, MoMoo Math and Science demonstrates how to solve word problems that involve multiple steps, such as multiplication followed by addition, to find total costs in real-life scenarios.

 Cookie Fundraiser

Katie sells cookies over 3 days:

Monday: 45 boxes

Tuesday: 32 boxes

Wednesday: 58 boxes

Each box costs $8

Totals:

45 × $8 = $360

32 × $8 = $256

58 × $8 = $464

Total earnings: $360 + $256 + $464 = $1,080

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🏛️  Museum Field Trip

24 students, each ticket costs $15

Bus rental costs $200

Ticket total: 24 × $15 = $360

Total trip cost: $360 + $200 = $560

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⚾ aseball Stadium Seating

8 rows, 15 seats per row = 120 seats

Each seat brings in $15

Multi-step Money Problems Free Worksheet

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Difference Atom-Molecule-Compound Free Worksheet and Summary

 

The video explains the differences between atoms, molecules, and compounds:

An atom is the smallest unit of matter, made of protons (positively charged), neutrons (neutral), and electrons (negatively charged). Protons and neutrons are located in the nucleus, while electrons orbit around it. The atomic number is determined by the number of protons.

A molecule forms when atoms are chemically bonded, often by sharing electrons (covalent bonds). Molecules can be made of the same type of atoms (e.g., ozone) or different types (e.g., water: H₂O).

A compound is a type of molecule made from different elements bonded together chemically (e.g., sugar made from carbon, hydrogen, and oxygen).

Additionally, an element is a pure substance made up of only one type of atom and is listed on the periodic table.

Atom-Compound-Mixture Free Worksheet

Atom-Compound Molecule - Key

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pH Scale - Free Worksheet and Summary

 

Here's a summary of the video transcript about the pH scale:

What is pH?

pH stands for potential of hydrogen.

It measures the concentration of hydrogen ions in a water-based substance.

The pH Scale:

Ranges from 0 to 14.

7 is neutral (e.g., pure water).

Below 7 = acidic

Above 7 = basic (alkaline)

Tips for Remembering:

"Lucky 7" or "7 is heaven" = neutral

"Base jump" = high = base = above 7

Examples of Substances:

Acids: milk, apple juice, lemon juice, stomach acid (often taste sour)

Bases: eggs, baking soda, ammonia, bleach (often taste bitter or feel slippery)

Color Indicators:

Acids: yellow → orange → red

Bases: green → blue → purple

Tip: B for Base and Blue

How Acids and Bases Work (Simplified):

Acids: gain hydrogen ions → create hydronium

Bases: lose hydrogen ions → create hydroxide

Logarithmic Nature:

Each number represents a 10x change.

Example: pH 5 is 10x more acidic than pH 6.

pH Scale Free Worksheet

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Scientific Method - Free Worksheet and Summary

 

Summary:

You sit down to eat lunch and notice your sandwich is soggy again—this time you've had enough. You decide to apply the scientific method to solve the problem.

Steps of the Scientific Method (with example):

Observation & Question: You notice the sandwich is soggy, especially on the jelly side, and ask “Why is my sandwich soggy?”

Research: You talk to friends and check online; many people use containers instead of bags.

Hypothesis: You guess that a bag makes the sandwich soggy, but a container will prevent this.

Experiment: You pack your sandwich in a container—but it’s still soggy. Hypothesis not supported.

New Hypothesis: You propose that putting peanut butter on both slices of bread (with jelly in the middle) will keep the sandwich dry.

New Test & Conclusion: This time, it works! The peanut butter acts as a barrier to prevent sogginess.

Communicate Results: You can now share this solution with others.

Final Message:

The scientific method is a practical and powerful process for solving everyday problems. When one hypothesis fails, you revise and test again, just like a scientist.

Scientific Method Worksheet

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Types of Levers - Free Worksheet and Lever

 

This video explains levers, a type of simple machine, and introduces a mnemonic device to help remember the three classes of levers.

What is a lever?

A lever consists of three parts:

Fulcrum (pivot point)

Force/Effort (applied input)

Load (what is being moved)

The placement of these parts determines the class of lever.

The Three Classes of Levers:

First-Class Lever:

Fulcrum in the middle

Example: Seesaw, scissors, pliers

Second-Class Lever:

Load in the middle

Example: Wheelbarrow, nutcracker, stapler

Third-Class Lever:

Effort in the middle

Example: Hockey stick, rake, hammer

Mnemonic Device:

Use the letters FLE (Fulcrum, Load, Effort) and write numbers 1 2 3 below them:

F → 1st class → Fulcrum in the middle

L → 2nd class → Load in the middle

E → 3rd class → Effort in the middle

Hope this helps you remember which part is central in each class of lever.

Free Lever Worksheet

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Science Variables in an Experiment - Free Worksheet and Summary

In science experiments, there are several types of variables:

Independent variable: The variable you change; found on the x-axis.

Dependent variable: The variable you measure; found on the y-axis.

Control variables: Variables kept constant to ensure accurate results.

Example: Testing if tire air pressure affects gas mileage.

Independent variable: Air pressure (20 PSI vs. 35 PSI)

Dependent variable: Gas mileage (miles per gallon)

Control variable: Same car used for each test

Summary:

Change the independent variable

Measure the dependent variable

Keep control variables the same

Closing note: “Kindness multiplies kindness.”

Science Variables Worksheet

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