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Mathematics
MATHEMATICS
VOCABULARY MATHEMATICS
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UNIT 1 : ALGEBRA
No. Vocabulary & Parts of speech Thai Definition Sentence
1 constant (adj.) คงที่ In “x + 5 = 9”, 5 and 9 are constant.
2 variable (n.) ตัวแปร
3 like terms (n.) พจน์เหมือน A variable is a quantity that may change within the context of a mathematical problem.
Like terms are terms whose variables (and their exponents such as the 2 in x2) are the same.
4 unlike terms (n.) พจน์ต่าง Unlike terms are two or more terms that are not like terms.
5 replace (v.) แทนที่ You need to replace a symbol like x with a definite "value".
6 algebraic expression (n.) แสดงในรูปเกี่ยว กับพีชคณิต
7 evaluate (v.) วัดผล An algebraic expression is a mathematical expression that consists of variables, numbers and operations.
To evaluate an algebraic expression means to find the value of the expression when the variable is replaced by a given number.
No. Vocabulary & Parts of speech Thai Definition Sentence
8 solve problem (v.) แก้ปัญหา To solve problem means to answer a math problem. 9 simplify (v.) ท�าให้เข้าใจง่าย To simplify 4x + 2x to the simplest term is 6x.
UNIT 2 : FRACTIONS
No. Vocabulary & Parts of speech Thai Definition Sentence
1 proper fraction (n.) เศษส่วนเชิงเดียว A proper fraction is a fraction with the top number less than the bottom.
2 improper fraction (n.) เศษส่วนเกิน An improper fraction is a fraction with the top number bigger than the bottom.
3 mixed number (n.) จ�านวนคละ A mixed number is a mixture of a whole number and a proper fraction.
4 one half (n.) ครึ่งหนึ่ง He shared one half of a pizza equally among 3 boys.
5 one quarter (n.) หนึ่งในสี่ส่วน Each child get one quarter of a pizza.
UNIT 3 : RATIO
No. Vocabulary & Parts of speech Thai Definition Sentence
1 ratio (n.) อัตราส่วน The ratio of the number of apple to the number of orange is 3 : 4.
2 equivalent ratio (n.) อัตราส่วนที่เท่ากัน 8 : 10 is equivalent ratio to 4 : 5.
No. Vocabulary & Parts of speech Thai Definition Sentence
3 twice (adv.) สองเท่า Twice a number x simply means '2x.
4 thrice (adv.) สามเท่า Thrice a number y is 3 times y.
5 simplest ratio (n.) อัตราส่วนอย่างต�่า Write the ratio 8 to 10 in the simplest ratio is 4 : 5.
6 quantity (n.) ปริมาณ The quantity is an amount; a number or expression having value.
UNIT 4 : PERCENTAGE
No. Vocabulary & Parts of speech Thai Definition Sentence
1 percent (n.) ต่อร้อย Percent means parts per hundred.
2 increase (v.) เพิ่มขึ้น Increase number is becoming greater or larger in amount, size, number or degree.
3 decrease (v.) ลดลง The percent of roses she had
decreased to 60%.
4 amount (n.) ปริมาณ Amount is a quantity of something.
5 tax (n.) ภาษี
6 interest rate (n.) อัตราดอกเบี้ย A tax that is added to the price of particular goods and services, usually as a percentage of the purchase price.
Alex borrows $5000 from the bank at a 5% interest rate, and has to pay $250 interest in the first year.
No. Vocabulary & Parts of speech Thai Definition Sentence
7 deposit (n.) การฝาก
8 withdraw (n.) การถอน
9 sell price (n.) ราคาขาย Deposit is a sum of money placed or kept in a bank account, usually to gain interest.
Withdraw is remove or take away (something) from a particular place or position.
Selling price is the price at which a product or service is sold to the buyer.
10 sale price (n.) ราคาลด
The sale price is the final price of the product which is being sold. 11 discount (n.) ส่วนลด Discount is a deduction from the usual cost of something,
UNIT 5 : ANGLES IN GEOMETRICAL FIGURES
No. Vocabulary & Parts of speech Thai Definition Sentence
1 straight line (n.) เส้นตรง The sum of angles on a straight line is 180 degree. 2 vertically (adv.) แนวตั้ง Vertically opposite angles are equal.
3 opposite (adj.) ตรงกันข้าม
4
5 equilateral triangle (n.) สามเหลี่ยม ด้านเท่า
isosceles triangle (n.) สามเหลี่ยม หน้าจั่ว Two angles that are opposite each other when two lines cross are equal.
An equilateral triangle has 3 equal sides and 3 equal angles.
An isosceles triangle has 2 equal sides and 2 equal angles.
No. Vocabulary & Parts of speech Thai Definition Sentence
6 right-angle triangle (n.) สามเหลี่ยม มุมฉาก
7 parallelogram (n.) สี่เหลี่ยมด้าน ขนาน
8 rhombus (n.) สี่เหลี่ยมขนม เปียกปูน
9 trapezium (n.) สี่เหลี่ยมคางหมู A right-angle triangle has one right angle.
A parallelogram is a 4-sides plane figure with 2 pairs of parallel sides.
A rhombus is 4-sided plane figure with all its sides equal.
An isosceles trapezium also has 2 equal side and 2 pairs of equal angles.
UNIT 6 : CIRCLE
No. Vocabulary & Parts of speech Thai Definition Sentence
1 circle (n.) วงกลม A circle is formed by a curve.
2 semicircle (n.) ครึ่งวงกลม A semicircle is formed by a curve and a straight line.
3 quarter circle (n.) หนึ่งในสี่ส่วน วงกลม A quarter circle is formed by a curve and 2 straight lines.
4 radius (n.) รัศมี The straight line from the center of the circumference of a circle is called the radius.
5 diameter (n.) เส้นผ่านศูนย์กลาง The straight line that passes through the center of the circle and connecting two points on the circumference is call the diameter.
No. Vocabulary & Parts of speech Thai Definition Sentence
6 area (n.) พื้นที่ The area of a figure is the space inside a plane figure.
7 circumference (n.) เส้นรอบวง The distance around a circle is called the circumference of the circle.
8 arc (n.) ส่วนโค้ง Arc is a part of the circumference of a circle.
UNIT 7 : SPEED
No. Vocabulary & Parts of speech Thai Definition Sentence
1 rate (n.) อัตรา A rate is a comparison of two quantity and its expressed as one quantity per unit of another quantity.
2 speed (n.) ความเร็ว Speed is distance travelled per unit time.
3 distance (n.) ระยะทาง A speed of 70 km/h mean the distance covered in 1 hour is 70 km.
4 remaining (adj.) ที่เหลือ He completed the remaining 180 km. in 3 h.
5 average speed (n.) ความเร็วเฉลี่ย Dave’s average speed for the whole journey was 64 km/h.
UNIT 8 : VOLUME
No. Vocabulary & Parts of speech Thai Definition Sentence
1 volume (n.) ปริมาตร The volume of the cuboid or rectangular prism, with unit cubes has been determined in cubic units.
2 length (n.) ความยาว The length of an object is its extended dimension, that is, its longest side.
3 width (n.) ความกว้าง The width is the distance from side to side.
4 height (n.) ความสูง
5 depth (n.) ความลึก
6 solid (n.) ของแข็ง
7 liquid (n.) ของเหลว
8 edge (n.) ขอบ Vertical distance from the top of an object or figure to its base is called height.
The distance between the nearest end and farthest end of an object is its depth.
A solid is a three dimensional (3D) object: width, depth and height.
A liquid is a sample of matter which has definite size or volume and will not have any particular shape of its own.
An edge is the outside limit of an object, area, or surface; a place or part farthest away from the center of something.
UNIT 9 : PIE CHART
No. Vocabulary & Parts of speech Thai Definition Sentence
1 present (v.) น�าเสนอ Discuss examples of data that may be presented in pie chart.
2 pie chart (n.) แผนภูมิวงกลม A pie chart (or a circle chart) is a circular statistical graphic.
3 data (n.) ข้อมูล The table shows the data present in a pie chart.
4 graph (n.) กราฟ A graph is a picture that represents data in graphic.
5 table (n.) ตาราง The table shows the number of boys and girls in a school.
UNIT 10 : SOLID FIGURES AND NETS
No. Vocabulary & Parts of speech Thai Definition Sentence
1 cube (n.) ลูกบาศก์ A cube has 6 square faces.
2 cuboid (n.) รูปทรงสี่เหลี่ยม A cuboid have 6 rectangular faces or 4 rectangular faces and 2 square faces.
3 cone (n.) โคน A solid cone has 1 flat face and 1 curved face.
4 cylinder (n.) ทรงกระบอก A solid cylinder has 2 flat faces and 1 curved face.
5 prism (n.) ปริซึม A prism has faces of the same shapes.
6 net (n.) โครงร่าง A net of a solid is a figure that can be folded to form the solid.
No. Vocabulary & Parts of speech Thai Definition Sentence
7 pyramid (n.) พีระมิด A pyramid has a base that is a flat face and sloping faces that are triangles. All the triangles meet at a common point.
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