Mental Maths Year 3 Worksheets - Math Salamanders Our Mental Math Year 3 Worksheets contain a wide range of different questions and math skills. The worksheets on this page follow on from the Series 1 worksheets. To access the easier Year 3 worksheets, please use the link below: Year 3 Mental Maths worksheets Series A (easier) Each sheet contains 16 questions, and is provided with an answer sheet.