Page 111 - Demo

110 Arrow-Puffin-3_Semester-1 MathsI. Add the following.1. 2773 + 10 = 6. 1427 + 100 = 2. 4217 + 10 = 7. 8123 + 1000 = 3. 5023 + 10 = 8. 7218 + 1000 = 4. 7523 + 100 = 9. 5623 + 1000 = 5. 3280 + 100 = 10. 7000 + 1000 = II. Add the following numbers mentally.a. 20 + 30 = _________ b. 70 + 80 = _________c. 300 + 400 = _________ d. 600 + 700 = _________%u2022 Two numbers added in any order gives the same sum.Example: 328 + 174 = 174 + 328 502 = 502%u2022 When 10 is added to a number, the tens place increases by 1. The digit at ones place remains the same.Examples: 2350 + 10 = 2360; 1284 + 10 = 1294; 2146 + 10 = 2156%u2022 When 100 is added to a number, the hundreds place increases by 1. The digits at ones and tens place remain the same.Examples: 6280 + 100 = 6380; 1382 + 100 = 1482; 4812 + 100 = 4912%u2022 When 1000 is added to a number, the thousands place increases by 1. The digits at ones, tens and hundreds place remain the same.Example: 4450 + 1000 = 5450 Let's Practise 3.1 Application