1. In addition and subtraction of two integers, sign of the answer depends
upon:
(a) Smaller number
(b) Their difference
(c)Their sum
(d) Greater numerical value
2. Identify the property used in : 2x13 + 8x13 = (2+8)13
(a) Commutative
(b)Closure
(c)Associative
(d) Distributive
3. Which one of the following is greater:
(a) 5.0
(b) 0.5
(c) 0.005
(d) 0.05
4. Which of the following does not represent pair of integer (a,b) such
that a = b = 2
(a)(-6,-3)
(b)(-2,1)
(c) (-10,-5)
(d) (8,4)
5. For a non zero integer a, which of the following is not defined?
(a)a 0
(b) a
(c)a 1
(d) 1a
Q2. DO AS DIRECTED
1. Solve [(-18) - (-12)] on number line
0.6 0.16
2. Evaluate :
+
0.3 0.4
3
15
3. Write the number in the box such that:
x-
=
98
4. Write a pair of integer whose product is (-36) and whose difference is 15
5. Divide - by (of 3)
6. What should be subtracted from -9876 to obtain -9512?
Answers
Step-by-step explanation:
Addition is a mathematical operation that represents the total amount of objects together in a collection. It is signified by the plus sign (+). For example, in the picture on the right, there are3 +2 apples—meaning three apples and two apples together, which is a total of5 apples. Therefore,3 +2 =5. Besides counting fruits, addition can also represent combining other physical and abstract quantities using different kinds of objects: negative numbers, fractions, irrational numbers, vectors, decimals, functions, matrices and more.
Addition follows several important patterns. It is commutative, meaning that order does not matter, and it is associative, meaning that when one adds more than two numbers, order in which addition is performed does not matter (see Summation). Repeated addition of1 is the same as counting; addition of0 does not change a number. Addition also obeys predictable rules concerning related operations such as subtraction and multiplication. All of these rules can be proven, starting with the addition of natural numbers and generalizing up through the real numbers and beyond. General binary operations that continue these patterns are studied in abstract algebra.
Performing addition is one of the simplest numerical tasks. Addition of very small numbers is accessible to toddlers; the most basic task,1 +1, can be performed by infants as young as five months and even some animals. In primary education, students are taught to add numbers in the decimal system, starting with single digits and progressively tackling more difficult problems. Mechanical aids range from the ancient abacus to the modern computer, where research on the most efficient implementations of addition continues to this day.
Answer:
1 = d
2 = a
3 = a
4 = sorry
5 = a