Integers | ICSE Class 7 Maths Chapter 1 | Addition & Subtraction #1
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Integers Chapter 1 Class 7 Maths ICSE
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Integers Chapter 1 Class 7 Maths ICSE
0:57 Introduction to integers
1:45 What are integers
2:53 Integers on Number line
4:51 Comparison of integers
5:45 Absolute value
7:00 Addition of Integers
10:38 Pause and Try
12:57 Additive Inverse
15:21 Subtraction of integers
16:54 The following number line shows the temperature in degree Celsius (oC) at different places in a particular day.
(i) Observe the number line and write the temperature of the places marked on it.
(ii) What is the difference in temperature between the hottest and the coldest places marked above?
(iii) Can we say the temperature of Srinagar and Shimla taken together is less than the temperature of Shimla? Is it also less than the temperature at Srinagar?
21:34 State whether the following statements are correct or incorrect. Correct those which are wrong:
(i) When two negative integers are added, we get a positive integer.
(ii) When a positive integer and a negative integer are added, we always get a negative integer.
(iii)Additive inverse of integer 8 is (-8) and additive inverse of (-8) is 8.
(iv) (-11) + 5 = 11 -5
(v) 13 + (-8) – (-5) = 13 + 8 - 5
23:53 Arrange 7, -5, 4, 0 and -4 in ascending order and mark them on a number line to check your answer.
24:53 Ruchi deposited ₹ 4370 in her account on Monday and then withdrew ₹ 2875 on Tuesday. Next day she deposited ₹ 1550. What was her balance on Thursday.
27:15 Evaluate:
(i) |-13| - |9|
(ii) |35 – 21| - |8 – 3|
28:36 Arrange the following integers in ascending order:
-39, 35, -102, 0, -51, -5, -6, 7
Arrange the following integers in descending order:
-31, 139, -203, -97, 0, 4208
29:49 State true or false:
(i) 0 is the successor of -1 in integers.
(ii) 0 has no predecessor in integers.
(iii) -2 is the predecessor of -1.
(iv) 0 is the greater than every negative integer.
30:30 Use signs
(i) (-11) + (-7) _________ (-11) – (-7)
(ii) 23 – 41 + 11 _________ 23 – 41 – 11
(iii) 40 – (-39) + (-5) ________ 40 + (-39) – (-5)
(iv) (-3) + 13 – (15) ________ 25 – (-2) + (-33)
33:27 Properties of Addition (Closure)
34:32 Commutative Property
35:26 Associative Property
36:05 Properties of Subtraction (Closure)
36:22 Commutative Property
37:05 Associative Property
39:07 Write a pair of integers whose sum is zero (0) but difference is 12.
39:58 In a quiz, team A scored -30, 20, 0 and Team B scored 20, 0, -30 in three successive rounds. Which team scored more? Can we say that we can add integers in any order?
41:37 Find the sum of integers -72, 237, 84, 72, -184, -37
44:24 Write two integers which are smaller than -3, but their difference is greater than -3.
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