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ITMC 2018 Grade 5 National Preliminary set01 Question 12

ITMC · ITMC 2018 Grade 5 National Preliminary set01

Question 12

How many integers from 100 to 999 have tens and units digits whose sum is 9?
  1. 81
  2. 90
  3. 100
  4. 180
  5. 450