Add and subtract mentally worksheet

In a series of engaging mathematics activities designed for Key Stage 2 learners, the objective is to sharpen mental arithmetic skills specifically in the realms of addition and subtraction. These exercises target the manipulation of 4-digit numbers with varying degrees of increments or decrements, ranging from ones up to thousands. For instance, Activity 1 employs a tactile approach where students use random 4-digit number cards alongside ones, tens, hundreds, or thousands digit cards, depending on their learning objectives. The process involves selecting two cards, performing the mental calculation as instructed by the teacher—either addition or subtraction—and recording the answer on a whiteboard. This activity not only tests their computational skills but also encourages the discussion of different strategies to arrive at the correct answer.

Subsequent activities build on this foundation with variations to challenge and assess the students' proficiency. Activity 2 introduces a competitive edge by having the children reveal their answers simultaneously upon the teacher's command. Activity 3 raises the stakes further by setting a target number and tasking the students to reach it through a series of four calculated operations, using each digit card only once. Incorrect strategy examples are provided to reinforce the rules. Finally, Activity 4 consolidates the learning by asking students to perform a sequence of both additions and subtractions to a central 4-digit number, using predetermined ones, tens, hundreds, and thousands digits. The outcomes are then shared and discussed, ensuring a comprehensive understanding of the concepts and techniques used in mental arithmetic.