About this worksheet
A Year 6 mental maths sheet with 21 questions and no written methods. Page 1 has twelve calculations in three rounds of four, from 450,000 + 300,000 to 1,000,000 - 1, with a hint to add 10,000 and adjust for 64,500 + 9,999. Page 2 starts with a four-step chain from 25,000 and a tick-two question for 500,000. Six mixed-operation chains follow, worked left to right, and a last question asks pupils to explain 800,000 - 799,994. The answers give short workings. It matches the England National Curriculum statement on mental calculation with large numbers.
