Page 34 - Arithmetic

8. Let the number of students in each row be y Let the number of students in each column be y Number of students = 45896
y × y = 45896
y2= 45896
y = √45896
45896 is not a perfect square.
y is approximately 214
y2= 214× 214 = 45796
Number of students left out = 45896 – 45796 = 100
3
9. √0.000027 = 0.03; Ronny calculates it correctly
3
10. √√0.000729
3
= √0.027 = 0.3
11. a + b = 17
a2 +b2 =149
Square the first equation
(a + b)2 = 172
a2 +b2 +2ab=289
Subtract the second equation from the above equation 2ab = 140
ab = 70
Possible number pair: 7 and 10; 35 and 2; 14 and 5 But the sum of the number should be 17.
So, the numbers are 7 and 10.
The smaller number is 7.
Page 33 of 55
Arithmetic Concept