Page 155 - Demo

154 Arrow-Puffin-3_Semester-1 MathsExample 1: Multiply 1823 by 4.%u2022 Multiply the digit in the ones place by 4. 4 x 3 = 12 ones = 1 ten + 2 ones Write 2 ones in ones column and carry over 1 ten to tens column.%u2022 Multiply the digit in tens place by 4. 4 x 2 = 8 tens%u2022 8 tens + 1 ten (carried over) = 9 tensTh H T O1 8 2 3 %u00d7 47 2 9 23 1Th H T O 2 4 3 %u00d7 51 2 1 52 1 14 tens = 1 hundred + 4 tens Write 4 in tens column and 1 in hundreds column.%u2022 Since there is no number to be multiplied in hundreds column, write 1 as it is in hundreds column.Therefore, 36 x 4 = 144Example 2: Multiply 243 by 5.%u2022 Multiply the digit in the ones place by 5. 3 x 5 = 15 = 1 ten + 5 ones Write 5 in ones column and carry over 1 ten to tens column.%u2022 Multiply the digit at tens place by 5. 4 x 5 = 20%u2022 Add 20 + 1 (carried over) = 21 tens = 2 hundreds + 1 ten. Write 1 ten in tens column and carry over 2 to hundreds place.%u2022 Multiply the digit in the hundreds place by 5. 2 x 5 = 10 hundreds + 2 hundreds (carried over) = 12 hundreds 1 thousand + 2 hundreds Write 2 in hundreds column and carry 1 in thousands column.%u2022 Write 1 as it is in thousands column.Therefore, 243 %u00d7 5 = 1215Let's Understand Conceptual Understanding