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122 Arrow-Puffin-3_Semester-1 Maths 3 tens %u2013 1 ten = 2 tens%u2022 Subtract the hundreds place : 9 hundreds - 4 hundreds = 5 hundredsTherefore, number of boys is 521.PROPERTIES OF SUBTRACTION%u2022 When %u20180%u2019 is subtracted from any number, the number remains unchanged. Examples : 7 0 = 7 132 0 = 132%u2022 A number subtracted from itself always gives 0. Examples : 12 12 = 0 315 315 = 0 2853 2853 = 0%u2022 When 10 is subtracted from a number, the digit at tens placedecreases by 1. The digit at ones place remains the same.Examples : 82 10 = 72 372 10 = 362 1408 10 = 1398%u2022 When 100 is subtracted from a number, the digit at hundreds place decreases by 1. The digits at ones and tens place remain the same.Examples : 587 100 = 487 1245 100 = 1145 7087 100 = 6987%u2022 When 1000 is subtracted from a number, the digit at thousands place decreases by 1. The digits at ones, tens and hundreds place remain the same.Examples : 4801 1000 = 3801 7984 1000 = 6984To check your answer after subtraction add the difference to the subtrahend. You get the minuend. We cannot change the order of subtraction.