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Bài 13: The minus sign and subtracing
(Dấu trừ và phép trừ)
Các em làm quen với một số thuật ngữ cơ bản trong bài học The minus sign and subtracing của môn Toán bằng Tiếng anh để nắm vững các từ vựng trong phép trừ và biết cách thức thực hiện làm phép trừ đúng quy tắc là như thế nào nhé...
Bài 13: The minus sign and subtracing
Introducing the minus sign and subtraction.Introducing the minus sign and subtraction.
Starry, are these magnets? Oh, they are. Look the number 1-2-3-4-5-6-7-8 and 9.Starry, are these magnets? Oh, they are. Look the number 1-2-3-4-5-6-7-8 and 9.
And this is a plus sign. We use this to do addition.And this is a plus sign. We use this to do addition.
Do you know what the sign is Starry?Do you know what the sign is Starry?
You don’t. This is the minus sign.You don’t. This is the minus sign.
We use this when we use subtraction.We use this when we use subtraction.
Remember take away.Remember take away.
Wait, let me explain!Wait, let me explain!
Suppose I have 5 marbles and I gave away 3 marbles.Suppose I have 5 marbles and I gave away 3 marbles.
How many marbles would I have with me?How many marbles would I have with me?
First I write the number 5, then I write the number 3 below it.First I write the number 5, then I write the number 3 below it.
Then I put the minus sign to show subtraction that 5 minus 3 reaches 2.Then I put the minus sign to show subtraction that 5 minus 3 reaches 2.
Now here are 7 triangles, I take away 4 triangles.Now here are 7 triangles, I take away 4 triangles.
How many triangles do I have left?How many triangles do I have left?
I first write the number 7, next I write the number 4 below it, then put the minus sign.I first write the number 7, next I write the number 4 below it, then put the minus sign.
Now 7 take away 4 is 3.Now 7 take away 4 is 3.
And here are 8 bows. I take away 2 bows. How many bows do I have left with me?And here are 8 bows. I take away 2 bows. How many bows do I have left with me?
Write the number 8, next write 2 below, then the minus sign. Now subtract 8 minus 2 is 6.Write the number 8, next write 2 below, then the minus sign. Now subtract 8 minus 2 is 6.
Finally, here are 9 cubes, I take away 5 cubes. How many cubes do I have left?Finally, here are 9 cubes, I take away 5 cubes. How many cubes do I have left?
We first write the number 9, next write the number 5 below, now the minus sign, next we subtract 5 from 9, so 9 minus 5 is 4.We first write the number 9, next write the number 5 below, now the minus sign, next we subtract 5 from 9, so 9 minus 5 is 4.
Starry, let do an activity together!Starry, let do an activity together!
Look at the picture and subtract.Look at the picture and subtract.
Dash marbles minus dash marbles equals dash.Dash marbles minus dash marbles equals dash.
8 marbles minus 2 marbles equals 6 marbles.8 marbles minus 2 marbles equals 6 marbles.
Dash marbles minus dash marbles equals dash.Dash marbles minus dash marbles equals dash.
5 marbles minus 1 marbles equals 4 marbles.5 marbles minus 1 marbles equals 4 marbles.
Dash marbles minus dash marbles equals dash.Dash marbles minus dash marbles equals dash.
4 marbles minus 4 marbles equals 0 marbles.4 marbles minus 4 marbles equals 0 marbles.
Dash marbles minus dash marbles equals dash.Dash marbles minus dash marbles equals dash.
7 marbles minus 5 marble equals 2 marbles.7 marbles minus 5 marble equals 2 marbles.
Dash marbles minus dash marbles equals dash.Dash marbles minus dash marbles equals dash.
10 marbles minus 8 marble equals 2 marbles.10 marbles minus 8 marble equals 2 marbles.
Dash marbles minus dash marbles equals dash.Dash marbles minus dash marbles equals dash.
4 marbles minus 3 marbles equals 1 marbles.4 marbles minus 3 marbles equals 1 marbles.
In this activity we have to choose the correct answer from the bracket.In this activity we have to choose the correct answer from the bracket.
6 minus 1 equals dash, 4 or 5. 6 minus 1 equals 5.6 minus 1 equals dash, 4 or 5. 6 minus 1 equals 5.
7 minus 6 equals dash, 1 or 3. 7 minus 6 equals 1.7 minus 6 equals dash, 1 or 3. 7 minus 6 equals 1.
5 minus 5 equals dash, 1 or 0, 5 minus 5 equals 0.5 minus 5 equals dash, 1 or 0, 5 minus 5 equals 0.
8 minus 5 equals dash, 3 or 5, 8 minus 5 equals 3.8 minus 5 equals dash, 3 or 5, 8 minus 5 equals 3.
6 minus 3 equals dash, 0 or 3, 6 minus 3 equals 3.6 minus 3 equals dash, 0 or 3, 6 minus 3 equals 3.
9 minus 4 equals dash, 5 or 4, 9 minus 4 equals 5.9 minus 4 equals dash, 5 or 4, 9 minus 4 equals 5.
Remember Starry, when you see the minus sign (-) do subtraction.Remember Starry, when you see the minus sign (-) do subtraction.
