Estimation with inverse operations worksheet

The "Estimation with inverse operations" worksheet, created by KS2Gems in 2022, is a resource designed to help children in Key Stage 2 develop their mathematical skills. The primary objectives of this worksheet are to enable students to estimate the answers to calculations and to use inverse operations to verify their solutions. The activities included are interactive and require the use of various number cards and objects to facilitate learning.

In the first activity, children are encouraged to select random 3-digit and 2-digit number cards, add them together using the formal column method, and then have their partner check the answer using the inverse operation, such as subtraction. This exercise helps to reinforce the relationship between addition and subtraction and the concept of checking work for accuracy. Variations of this activity include using a mix of different digit cards to add a level of complexity. The second activity focuses on estimation, where children use 2-digit and 3-digit number cards to reach a target number through addition or subtraction. They are asked to record their choices and explain their reasoning, which promotes critical thinking. Finally, the third activity involves estimating the quantity of a large pile of various objects, such as dried pasta or Lego, and then counting them using efficient methods like grouping in fives or tens. This practical approach helps children to compare their estimates with actual counts, enhancing their estimating and counting skills.