2021 SQA Nat 5 Mathematics Paper 1: nos. 1, 2 & 3

1. Calculate the magnitude of a vector in 3D given its components . 2. Subtract two given mixed numbers. 3. Expand and simplify an expression involving the sum of the products of expressions. Instructional exercise consisting of questions 1, 2 & 3 from the first paper of the 2021 SQA National 5 Mathematics resource paper. Where appropriate the alternative methods for solving the problem are also given. Set out in stages of 'try then check' the worked solution to each part of the question. Including indications of where each mark is allocated, and the requirements for that mark, according to the marking scheme.