เคล็ดลับที่จะนำมาเล่าสู่กันฟังวันนี

เคล็ดลับที่จะนำมาเล่าสู่กันฟังวันนี้ก็คือ ” เทคนิคการคูณเร็ว” ซึ่งจริงๆแล้วมีอยู่หลายแบบ
ตามลักษณะของโจทย์ แต่ที่เราน่าจะพบบ่อยครั้งในวิชาคณิต ฟิสิกส์ หรือเคมี ได้แก่การคูณใน ลักษณะต่อไปนี้

คูณด้วย 5 [ Trick คือ มองเป็นการคูณด้วย 10/2 ]
เพราะการหารด้วย 2 น่าจะทำได้ง่ายกว่าคูณด้วย 5
ตัวอย่าง เช่น
257x5 = 257x(10/2) = 2570/2 = 1285
4,357x5 = 4,357x(10/2) = 43,570/2 = 21,785

คูณด้วย 25 [ Trick คือ 25x4 เป็น 100 ]
พยามยามแยกตัวเลขเพื่อจับคู่ 4 กับ 25 คูณกันให้ได้ 100
ตัวอย่าง เช่น
24x25 = 6x (4 x 25) = 600 96x25 = 24x(4x25) = 2,400
32x75 = (8x4)x(25x3) = (8x3)x(4x25) = 2,400
256x125 = (64x4)x(25x5) = (64x5)x(4x25) = 32,000

คูณด้วย 125 [Trick คือ 125x4 เป็น 500 หรือ 125x8 เป็น 1,000 แล้วแต่กรณี]
ตัวอย่าง เช่น
36x125 = 9x(4x125) = 9x500 = 4,500
32 x 125 = 4x(8x125) = 4,000
72x 375 = (9x8)x(125x3) = (9x3)x(8x125) = 27,000
128x575 = (16x8)x(125x5) = (16x5)x(8x125) = 80,000



ส่วนใครจะคิดได้เร็วได้ช้าก็ขึ้นอยู่กับความชำนาญในการจับคู่ตัวเลขนะครับ
ลองฝึกฝนบ่อยๆ ใช้เวลาไม่นานเดี่๋ยวก็จับหลักได้เอง เพราะเราจะคุ้นเคย
กับตัวเลขที่ต้องจับคู่ไปโดยอัตโนมัติ

ผลลัพธ์ (อังกฤษ) 1:

Tips to take to each other, to listen to these days is "fast multiplication techniques" which actually exist, According to the nature of the problem, but that we would encounter often in math physics or chemistry are multiplying in the following ways: Multiplied by 5 [Trick is considered to be multiplied by 10/2] Because of the Division by 2 is probably easier, multiplied by 5. For example, the 257x5 = 257x(10/2) = 2570/2 = 1285 4,357x5 = 4,357x(10/2) = 43,570/2 = 21,785 Multiply by 25 [Trick is 25x4 as 100] Separate figures willing to match 4 to 100, multiply, 25. For example, the 24x25 = 6x (4 x 25) = 600 96x25 = 24x(4x25) = 2,400 32x75 = (8x4)x(25x3) = (8x3)x(4x25) = 2,400 256x125 = (64x4)x(25x5) = (64x5)x(4x25) = 32,000 Multiply by 125 [Trick is 125x4 is 125x8 is 500 or 1000, but if] For example, the 36x125 = 9x(4x125) = 9x500 = 4,500 32 x 125 = 4x(8x125) = 4,000 72x 375 = (9x8)x(125x3) = (9x3)x(8x125) = 27,000 128x575 = (16x8)x(125x5) = (16x5)x(8x125) = 80,000 For those who are thinking of faster performance, based on our expertise in matching the lekna lol. Try to practice frequently use single-core catcher, no time, because we are accustomed to. With the numbers must match.

ผลลัพธ์ (อังกฤษ) 2:

The trick to be repeated today, is "multiplying fast technique", which actually have several
characteristics of prosecution. But we will meet frequently in mathematics, physics or chemistry are multiplying. The following characteristics multiplied by 5 [Trick is looking to multiply by 10/2] because it will be easier divided by 2 multiplied by 5 for example 257x5 = 257x (10/2) = 2570/2 = 1,285 = 4,357x5. 4,357x (10/2) = 43,570 / 2 = 21,785 multiplied by 25 [Trick is a 25x4 100] tried to separate the pair with 4 25th multiplied to 100 , for example 24x25 = 6x (4 x 25) = 600. 96x25 = 24x (4x25) = 2,400 32x75 = (8x4) x (25x3) = (8x3) x (4x25) = 2,400 256x125 = (64x4) x (25x5) = (64x5) x (4x25) = 32,000 multiplied by 125 [. Trick is 125x4 500 or 125x8 the 1000 case] , for example 36x125 = 9x (4x125) = 9x500 = 4,500 32 x 125 = 4x (8x125) = 4,000 72x 375 = (9x8) x (125x3) = (9x3) x (. 8x125) = 27,000 = 128x575 (16x8) x (125x5) = (16x5) x (8x125) = 80,000 who thought the speed was slow, it depends on the skill to match the numbers I try to practice a lot. It did not take long Single main draw itself. We are familiar with the numbers must be matched automatically.

ผลลัพธ์ (อังกฤษ) 3:

tips to bring to tell me today is "fast multiplication technique", which actually there are many
according to the characteristics of the problem, but we have found frequently in mathematics. Physics or chemistry, including the multiplication in the following manner

.Multiplied by 5 [Trick is look is multiplied by 10 / 2]
for division by 2 should be easier than multiplied by 5
samples, such as
257x5 = 257x (10 / 2). = 2570 / 2 = 1285
4 357x5 =,, 4 357x (10 / 2) = 43 570 /, 2 = 21 785

, multiplied by the 25 [Trick is 25x4 is 100]
.Try to separate the number to match 4 with 25 multiplied together 100

= example 24x25 6x (4 x 25) = 600 96x25 = 24x (4x25) = 2, the 400
. 32x75 = (8x4) x (25x3) = (8x3) x (4x25) = 2 400
, 256x125 = (64x4) x (25x5) = (64x5) x (4x25) = 32 000

, multiplied by the 125 [Trick. 125x4 is 500 or, as the case 125x8 is 1 000]
.For example,
36x125 = 9x (4x125) = 9x500 = 4 500
32, X 125 = 4x (8x125) = 4 000
72x, 375 = (9x8) x (125x3) = (9x3) x (8x125). 27 000
128x575 =, = (16x8) x (125x5) = (16x5) x (8x125) = 80 000



, and who will think fast slow, it depends on skills in matching the math.
.Try to practice longer wait, wait, it praise yourself, because we are familiar with the numbers ต้องจับคู่
to automatically.