We have to compute (+20) + ( ndash;1). The magnitudes of +20 is 20 and that of ndash;1 is 1. The difference between them is 20 ndash; 1 = 19 The magnitu ...

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Byju's Answer

Standard VI

Mathematics

Integers

Add:18+20,-1

Question

Add:

(18) +20, −1

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Solution

We have to compute (+20) + (–1).
The magnitudes of +20 is 20 and that of –1 is 1.
The difference between them is 20 – 1 = 19
The magnitude 20 is bigger than 1. So, we will give 19 the sign of +20, i.e., the positive sign.
∴ (+20) + (–1) = +19

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Add: (18) +20, −1

We have to compute (+20) + (–1). The magnitudes of +20 is 20 and that of –1 is 1. The difference between them is 20 – 1 = 19 The magnitude 20 is bigger than 1. So, we will give 19 the sign of +20, i.e., the positive sign. ∴ (+20) + (–1) = +19

Add:

(18) +20, −1

We have to compute (+20) + (–1).
The magnitudes of +20 is 20 and that of –1 is 1.
The difference between them is 20 – 1 = 19
The magnitude 20 is bigger than 1. So, we will give 19 the sign of +20, i.e., the positive sign.
∴ (+20) + (–1) = +19