You will learn the definition and the properties of angles of the circles.
You will learn how to make use of the properties of angles in circles.
Learning effect
You recognize angles in circles. You can apply the properties of angles in the circle.
You can describe the ways of applying the properties of angles in circles in English.
Introduction
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Revise the known methods of column multiplicationcolumn multiplicationcolumn multiplication of natural numbers by single‑digit numbers, by numbers ending with zeros and methods of column addition.
Think:
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- How to multiply two two‑digit numbers by themselves? - How to multiply such numbers using mental maths? - Is it possible to use the column multiplication patterns to do the following operations: dwadzieścia trzy razy trzydzieści jeden, sto dwadzieścia pięć razy piętnaście, etc.?
- How to multiply two two‑digit numbers by themselves? - How to multiply such numbers using mental maths? - Is it possible to use the column multiplication patterns to do the following operations: dwadzieścia trzy razy trzydzieści jeden, sto dwadzieścia pięć razy piętnaście, etc.?
- How to multiply two two‑digit numbers by themselves? - How to multiply such numbers using mental maths? - Is it possible to use the column multiplicationcolumn multiplicationcolumn multiplication patterns to do the following operations , , etc.?
Task 1
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Open the slideshow and observe how we multiply natural numbers by two‑digit numbers in columns. After finishing the task, present the results of your observations and compare them with the ones presented below.
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Conclusions:
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- in column multiplication we write the numbers one under the other so that the ones are under ones and tens under the tens, - we multiply the first factor by successive digits of the second factor.
We write the products received and add them to one another.
Task 2
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1. Analyze the example shown below. 2. Write down the pattern for multiplication of natural numbers by three‑digit numbers. 3. Write down what patterns you learned before. 4. Perform the column multiplicationcolumn multiplicationcolumn multiplication of natural numbers using the learned pattern. a) b)
Example 1
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Task 3
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1. Analyze the example shown below. 2. Write the pattern for multiplication of natural numbers by three‑digit numbers in which the digit of hundreds is zero. 3. Write what patterns you learned before. 4. Perform the column multiplication of natural numbers using the learned pattern. a) b)
Example 2
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Task 4
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1. Analyze the example shown below. 2. Write down the pattern for multiplication of natural numbers by multi‑digit numbersmulti‑digit numbersmulti‑digit numbers ending with zeros. 3. Write what patterns you learned before. 4. Perform the column multiplicationcolumn multiplicationcolumn multiplication of natural numbers using the learned pattern. a) b)
Example 3
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Present the results of your work and formulate relevant conclusions.
Conclusions:
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For example 1 - we write the numbers one under the other so that the ones are under ones and tens under tens. - we multiply the first factor by successive digits of the second factor. We write down the products received and add them to one another. - multiplication of natural numbers by three‑digit numbers follows the same pattern as multiplying natural numbers by two‑digit numbers.
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For example 2 - we write the numbers one under the other so that the ones are under ones and tens under tens. - we multiply the first factor by successive digits of the second factor. We write down the products received and add them to one another. - multiplying by tens digit equal to zero does not affect the final result. We can thus omit the product obtained in this way. - multiplication of natural numbers by three‑digit numbers follows the same pattern as multiplying natural numbers by two‑digit numbers.
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For example 3 - in column multiplicationcolumn multiplicationcolumn multiplication of two factorsfactorsfactors ending with zeros, we extend all the final zeros of both numbers to the right. - then we multiply the numbers without zeros in accordance with the learned patterns. We add as many zeros to the result as there are in both of the numbers together.
The teacher assesses the students' work and clarifies any doubts.
Task 5
An extra task:
Multiply in columns.
two million seven hundred and four times one hundred and three
Task 6
Do the revision tasks.
Remember:
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- to perform column of the natural number by a multi‑digit number, write the numbers one under the other so that the ones are under ones and tens under the tens, - then we multiply the first factor by successive digits of the second factor. We write down the products received and add them to themselves, - multiplying by a digit equal to zero, not placed at the end of the number, does not affect the final result. We can thus omit the product obtained in this way.
Exercises
Exercise 1
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Exercise 2
Multiply in columns.
a)
b)
c)
a)
b)
c)
Exercise 3
Calculate which number is greater: - the number is times greater than the number , - the number is times greater than the number . Write down the answer in English.