You can read posting Hairu and the numbers to understand number concept.
Lower primary school mathematics question LPQ9
Hairu had 1 879 stickers and Sarin had 764 more stickers than Hairu but 426 fewer stickers than Fatimah. How many stickers did Fatimah have?
Fatimah had 1879 + 764 + 426 = 3069 stickers