Question 1 (Page 26) - Comparing Expressions without fully calculating - Chapter 2 Class 7 - Arithmetic Expressions (Ganita Prakash)

Transcript

Question 1 (Page 26) Use ‘>’ or ‘<’ or ‘=’ in each of the following expressions to compare them. Can you do it without complicated calculations? Explain your thinking in each case. (a) 245 + 289 246 + 285 We visualize 245 + 289 as And, 1022 + 128 as Since first expression has 3 more Thus, 245 + 289 > 246 + 285 Question 1 (Page 26) Use ‘>’ or ‘<’ or ‘=’ in each of the following expressions to compare them. Can you do it without complicated calculations? Explain your thinking in each case. (b) 273 – 145 272 – 144 We visualize 273 – 145 as And, 272 – 144 as Eventually both the values are SAME Thus, 273 – 145 = 272 – 144 Question 1 (Page 26) Use ‘>’ or ‘<’ or ‘=’ in each of the following expressions to compare them. Can you do it without complicated calculations? Explain your thinking in each case. (c) 364 + 587 363 + 589 We visualize 364 + 587 as And, 363 + 589 as We visualize 364 + 587 as And, 363 + 589 as We visualize 364 + 587 as And, 363 + 589 as Since second expression has 1 more Thus, 364 + 587 < 363 + 589 Question 1 (Page 26) Use ‘>’ or ‘<’ or ‘=’ in each of the following expressions to compare them. Can you do it without complicated calculations? Explain your thinking in each case. (d) 124 + 245 129 + 245 We visualize 245 + 289 as And, 1022 + 128 as Since second expression has 5 more Thus, 124 + 245 < 129 + 245 Question 1 (Page 26) Use ‘>’ or ‘<’ or ‘=’ in each of the following expressions to compare them. Can you do it without complicated calculations? Explain your thinking in each case. (e) 213 – 77 214 – 76 We visualize 213 – 77 as And, 214 – 76 as Since second expression has 2 more Thus, 213 – 77 < 214 – 76