# KS2, Calculation

**This is a follow-up to our popular Calculator Activity-1.**

While that original resource focused exclusively on Addition, this one helps children develop their understanding (and accuracy) when reading written numbers and calculating with **both** addition and subtraction.

**This is a great way to get children discussing the mental strategies they use when calculating**.

The idea is that the children have to follow a series of instructions to arrive at an unknown number. The image on the left shows a chain of number operations. The starting point is **2**, to which 4 is added (making 6), this is then multiplied by 2 (giving 12), divided by 6 (making 2) then, finally, 1 is added (to end with 3). **Read more »**

**This is a quick way to demonstrate some ‘mathemagical’ powers** – it also serves a useful purpose in that it will give children an entertaining opportunity to make use of investigative/problem solving skills.

You show the children a set of ‘raffle tickets’ each of which features a small identification number and a main four-digit ‘raffle’ number. Ask a child to pick a ticket at random, to show it to the rest of the class and to tell you only the small identification number. **Read more »**

**Here's another 'why didn't I think of that' moment - a stunning place-value and calculation activity (well, we think it's fairly stunning).** I had nearly forgotten about it until we started looking through some old work files in the garage. **Read more »**

**This is a straightforward number chasing game for two children using a calculator**. The game give children plenty of practice using a calculator and encourages them to solve multiplication and division problems mentally. **Read more »**

To play the game, the boards should be cut out and laminated. Children then write on them with a whiteboard pen. The players also need a set of 0-9 digit cards between them. **Read more »**

**In this simple mathematical trick you are able to tell the children the value of two secretly rolled dice.** This works well with a group of children, but could also work well with the whole class.

**Here's how it goes:** **Read more »**