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Table of Contents
In this lesson, we will try to understand how to tell and write time to the nearest minute, how to solve problems involving time, and how to measure and estimate liquid volumes and masses of objects using standard units of measurements.
See the fact file below for more information on the measurement and estimation of intervals of time, liquid volumes, and masses of objects or alternatively, you can download our 38-page Measurement and Estimation of Intervals of Time, Liquid Volumes, and Masses of Objects worksheet pack to utilise within the classroom or home environment.
Key Facts & Information
TIME
- We have to first remind ourselves that a clock is a number line formed in a circular shape.
- Therefore, we can read time by thinking of it as a number line.
- When reading the hour hand (or the short hand), we have to keep in mind that it is following the clockwise motion, and that we are only reading the numbers from 1 to 12 (the large numbers).
SOLVING PROBLEMS INVOLVING TIME
- Now that we know how to read and write time, let us move on to solving problems involving time.
- First, to solve a time problem, we have to know how to identify the start time, end time, and change in time.
- Eliza wakes up at 6:00 am. She then leaves for school at 7:00 am. How long does it take for her to get ready for school?
- Read the problem above and identify the parts.
- We know that the start time and the end time are given. Therefore, what we are looking for is the change in time, for us to answer the question.
- We can use the number line.
- We can also solve time problems using tables
ESTIMATING THE MASS OF AN OBJECT
- In this section, we will try to understand how we can estimate the mass of an object.
- Note that in this lesson, we will use the “~” symbol. This is a symbol used to say “approximately”.
- How do we estimate?
- We can estimate by reasoning or by comparing to benchmark objects.
- We have an idea that a mobile phone weighs around 100 grams, and that a pineapple weighs around 1 kilogram or 1000 grams.
- Therefore, we can assume that the corn weighs around 500 grams.
- Now, we can also use simple reasoning to estimate the weight of the corn.
- Have you ever accompanied your parent to the supermarket? You know that whenever they buy a kilo of corn, there are around 2 to 3 pieces inside the bag.
- We can use this knowledge to say that one corn cob weighs around 300 to 500 grams.
ESTIMATING THE VOLUME OF AN OBJECT
- Just like in the previous section, we will use reasoning and benchmark objects to estimate the volume of an object.
- Assuming that we know that the smaller bottle of water contains 1 liter of water and the large bottle of water contains 10 liters of water, we can, by reasoning, assume that the pail of water contains around 5 liters of water.
STANDARD UNITS OF MEASUREMENT
- We know about grams (g), kilograms (kg), milliliters (mL), and liters (L). In this section, we will understand how to convert from g to kg, kg to g, mL to L, and L to mL.
- First, milliliter to liter. We have to remember that milliliter is a smaller unit than liter.
- 1 milliliter (mL) = 1/1000 liter (L)
- Now, given this equation, we can already derive the equation on how to convert liters to milliliters.
- 1 liter (L) = 1000 milliliters (mL)
- Let us move on to grams to kilograms.
- 1 gram (g) = 1/1000 kilogram (kg)
- Now, given this equation, we can already derive the equation on how to convert liters to milliliters.
- 1 kilogram (kg) = 1000 grams (g)
MEASURING MASS AND VOLUME
- The best way to know the mass or volume of an object is to use measuring tools such as weighing scales, graduated cylinders with labels, and other measuring tools.
SOLVING PROBLEMS INVOLVING ADDITION AND SUBTRACTION
- Throughout this section and the next section, we will assume that all units given in a problem are the same, therefore no conversion is needed.
- First, we need to identify keywords that will help us identify whether we need to use addition or subtraction.
- ADDITION
- add
- in all
- both
- sum
- total
- combined
- plus
- together
- SUBTRACTION
- remain
- fewer
- subtract
- have left
- less than
- many more
- take away
- minus
- Now, let us use the given problem below as a sample problem.
- Steven has 30 grams of bananas while Andrea has 46 grams of bananas. What is the total grams of bananas that Steven and Andrea have?
- For starters, we need to identify the relevant information from the word problem.
- Identify the given and what we are looking for.
- Since we have already identified the operation, we can already write the equation.
- 30 g + 46 g = 76 g
- Thus, the total grams of bananas that Steven and Andrea have is 76 grams.
SOLVING PROBLEMS INVOLVING MULTIPLICATION AND DIVISION
- In this section, we will understand how to solve problems involving multiplication and division.
- First, we need to identify the relevant words that would help us identify what operation is needed.
- ADDITION
- altogether
- multiplied by
- total
- in all
- product of
- SUBTRACTION
- split
- each
- per
- separated
- equally
- We will use the sample word problem below throughout the section.
- Maria has 16 kilograms of apples. She needs to distribute the apples into 4 bags. How many kilograms of apples will be in each bag if they all need to have an equal amount?
- Like in the previous section, we need to identify the relevant information.
- Since we have already listed the relevant information, we can now write the equation.
- 16 kg ÷ 4 bags = 4 kg per bag
- Therefore, there would be 4 kilograms of apples per bag.
Measurement and Estimation of Intervals of Time, Liquid Volumes, and Masses of Objects Worksheets
This is a fantastic bundle which includes everything you need to know about the measurement and estimation of intervals of time, liquid volumes, and masses of objects across 38 in-depth pages. These are ready-to-use Measurement and Estimation of Intervals of Time, Liquid Volumes, and Masses of Objects worksheets that are perfect for teaching students how to tell and write time to the nearest minute, how to solve problems involving time, and how to measure and estimate liquid volumes and masses of objects using standard units of measurements.
Complete List Of Included Worksheets
- Lesson Plan
- Measurement and Estimation of Intervals of Time, Liquid Volumes, and Masses of Objects
- What Time Is It?
- Hop Hop
- Timetable
- Heavier?
- Read the Volume
- Convert
- Connect Them
- Give or Take
- Solve Them All
- Help Me!
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Use With Any Curriculum
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