My Pals Are Here Maths Pdf — 5a

Miss Lee, the head of the mathematics department, had a problem. The printer in the office had jammed while printing the end-of-year exam papers for Primary 5. When the technician fixed it, the papers printed in a scattered, messy pile—completely out of order. The problem? The pages were numbered from 1 to 180 , but they were stacked in reverse and in chunks.

Number of terms: ( 180 \div 18 = 10 ) multiples of 9 with even multipliers (2,4,6,…,20) → yes, 10 terms. My Pals Are Here Maths Pdf 5a

Better: A: 6×(odd) = 18k? Let odd=2m+1. Then 6(2m+1)=12m+6. For this to be multiple of 18: 12m+6 divisible by 18 → 12m+6=18p → divide 6: 2m+1=3p → 2m+1 odd multiple of 3. B: 9×(even)=9×2n=18n. So A∩B = numbers that are 18×k where k is both an odd integer (from A) and any integer (from B) → Wait B's even multiplier: 9×2n=18n, so B includes all multiples of 18. A's odd multiplier: 6×(odd) = 6,18,30,42,54,66,78,90,102,114,126,138,150,162,174. Multiples of 18 in that list: 18,54,90,126,162 → yes 5 numbers. Those are in A∩B. So intersection size = 5. Miss Lee, the head of the mathematics department,