INSTITUT PENDIDIKAN GURU KAMPUS TEMENGGONG IBRAHIM

Benefits:Menggunakan Teknik jari akan mengujudkan minat

pada matematik dan menghindari takut akan matematik.

Kita boleh melakukakan empat operasi asas menggunakan jari dan boleh mendapatkan hasil yang cepat tanpa menggunaka pen dan kertas.

Kita juga boleh menggunakan teknik ini mengajar matematik kepada pelajar pekak dan bisu.

4+2-1=

8+1-6=

6+3-5=

10+40-20=

40-10+50=

70-20+30=

LATIHAN

Teori Pengiraan Mental - 3

Exercise

81+14-11=

67-52+21=

21+3-24=

Multiplication Using Fingers

Jadual Pendaraban boleh dibahagikan kepada 3 jenis

Sifir bawah sepuluh (6-10) Sifir sepuluh ke atas (11-15) Sifir bawah dua puluh (16-20)

Below Ten Tables (6-10) Namakan jari kelingking sebagai 6, jari manis sebagai 7, jari

tengah sebagai 8, jari telunjuk sebagai 9 dan ibu jari sebagai 10.

Langkah 1: dekatkan kedua-dua jari yang diperlukan untuk pendaraban nombor.

Langkah 2: Anggapkan jari yang terlibat (sebelah bawah) sebagai rumah puluh.

Langkah 3: Anggapkan hasildarab bilangan jari yang selebihnya (sebalah bawah) sebagai rumah unit..

Example 1: For 7 x 8 Step 1: Join the fingers 7 and 8. 

Step 2: Take the involved 5 fingers as tens.Step 3: Take the products of the remaining fingers 3

x 2 = 6 as 0. Hence 7 x 8 = 56

Example 2: For 9 x 9 Step 1: Join the fingers 9 and 9.

Step 2: Take the involved 8 fingers as tens.Step 3: Take the products of the remaining fingers 1 x

1 =1 as one. Hence 9 x 9 = 81

Above Ten Tables (11-15) Name the little finger as 11, ring finger as 12, middle finger

as 13, forefinger as 14 and thumb as 15 of your two hands.

Step 1: Join the fingers, which the product is required. Step 2: Take the product of the involved fingers as ones.Step 3: Take the sum of the involved fingers as tens.Step 4: Take always 1 as the hundreds place.

Example 1: For 12 x 13 Step 1: Join the fingers 12 and 13. 

Step 2: Take the product of the involved fingers 2 x 3 = 6 as ones.

Step 3: Take the sum of the involved fingers 2 + 3 = 5 as tens.

Step 4: Take 1 as hundreds. Hence 12 x 13 = 156

Example 2: For 13 x 13Step 1: Join the fingers 13 and 13. 

Step 2: Take the product of the involved fingers 3 x 3 = 9 as ones.

Step 3: Take the sum of the involved fingers 3 + 3 = 6 as tens. Its value is 60.

Step 4: Take 1 as hundred. Its value is 100. Hence 13 x 13 = 100 + 60 + 9 = 169

Below Twenties Tables (16 – 20) Name the little finger as 16, ring finger as 17, middle finger as 18.

fore finger as 19 and thumb as 20 of your two hands. Step 1: Join the fingers which the product is required.

Step 2: Take the product of the remaining fingers on either side and take it as ones.

Step 3: Take the sum of the involved fingers as twenties.Step 4: Take 2 as hundreds.

Example 1: For 17 x 18 Step 1: Join the fingers 17 and 18. 

Step 2: Take the product of the remaining fingers 3 x 2 = 6 as ones.

Step 3: Take the sum of the involved fingers 2 + 3 = 5 as twenties. Its value is 5 x 20 = 100

Step 4: Take 2 as hundreds. Hence 17 x 18 = 200 + 100 + 6 = 306

Example 2: For 19 x 19Step 1: Join the fingers 19 and 19.

Step 2: Take the product of the remaining fingers 1 x 1 = 1 as units.

Step 3: Take the sum of the involved fingers 4 + 4 = 8 as twenties. Its value is 8 x 20 = 160.

Step 4 : Take 2 as hundreds. Hence 19 x 19 = 200 + 160 + 1 = 361

Multiplying By Nine

Here is a simple way to multiply by nine using your fingers.

Hold both your hands up with palms facing you. Number the fingers from left to right as one to ten.

Now hold down the finger of the number you want to multiply by nine. In this example, we are going to multiply by eight, so the eighth finger is held down.

The fingers to the left as the tens and the fingers to the right are units. In this example, there are seven fingers to the left (marked blue) and two to the right (marked red) which makes 72.

Hold your fists next door to each other, knuckles upwards. Label the knuckles and gaps between the knuckles with the months.You have a knuckle left over, so ignore it. Now, all the knuckle months have 31 days, and the gaps are either February, or have 30 days.

MATHS KNOWLEDGE