Question

Give a rough estimate and also a closer estimate of the following sums
215 + 700​

Answer 1

Answer:

estimated value= 200+700

= 900

Step-by-step explanation:

hope it helps u ...

Answer 2

Step-by-step explanation:

Mathematics NCERT Grade 6, Chapter 1: Knowing Our Numbers- Students have already added, subtracted, multiplied and divided numbers. In this chapter, students will learn more interesting things. This includes large numbers, their comparison, arrangement, shifting the digits, use of commas etc. Students will also learn about the estimation of numbers by rounding off. The first portion of the chapter covers the topics Comparing numbers, Large numbers in practice.

Given two numbers, one with the more digits is the greater number.

The smallest four-digit number is 1000.

The largest three-digit number is 999.

Ascending order means arrangement from the smallest to the greatest.

Descending order means arrangement from the greatest to the smallest.

Since the chapter revolves around larger numbers, the use of commas is thus important. When the students have understood about the formation of numbers, the next step is comparing and arranging them in proper order. This is done through ascending and descending order, shifting the digits to form new number. Next is introduction of 10,000 and 1,00,000 followed by revisiting the place value. Students will learn about the aid in reading and writing large numbers which is through the use of tables and proper indicators.

After exercise 1.2 the topic estimation is explained with the help of news.

Explanation of the topic estimation is done in several parts:

Estimating to the nearest tens by rounding off

Estimating to the nearest hundreds by rounding off

Estimating to the nearest thousands by rounding off

Estimating outcomes of number situations

To estimate sum or difference

To estimate products

One can study about larger numbers through real life examples, different units and their inter conversion.

Apart from that, topics like Using brackets, Indian and International system of numeration followed by roman numerals are also discussed.

Use of brackets allows us to avoid confusion in the problems where we need to carry more than one number operations.

We use the Hindu-Arabic system of numerals. Another system of writing numerals is the roman system.

Certain rules are listed in the section roman numerals. Students are advised to keep these rules in mind while writing or reading the roman numerals.

The chapter is supplemented with solved examples as well as unsolved exercises.

The entire chapter is summarized at the end with a focus on important points

Page No 12:

Question 1:

Fill in the blanks:

(a). 1 lakh = _________ ten thousand.

(b). 1 million = _________ hundred thousand.

(c). 1 crore = _________ ten lakh.

(d). 1 crore = _________ million.

(e). 1 million = _________ lakh.

ANSWER:

(a) lakh =ten thousand

(1 lakh = 1,00,000 and ten thousand = 10,000)

(b) 1 million =hundred thousand

(1 million = 1,000,000 and 1 hundred thousand = 1, 00,000)

(c) 1 crore = ten lakh

(1 crore = 1,00,00,000 and Ten lakh = 10,00,000)

(d) 1 crore = million

(1 crore = 1,00,00,000 and 1 million = 1,000,000)

(e) 1 million = lakh

(1 million = 1,000,000 and 1 lakh = 1,00,000