Duo Sum in Numbers Ninja 20

Activity in Numbers Ninja 20Duo Sum

What is the goal? Find the invalid number.

How to play? Make groups consisting of two numbers in the grid, either horizontal or vertical, so that their sum is equal to the number given in the box below. You should not choose the numbers in the group you have created again (cross them out as you go). You will be left with one number that will not fit. Find that number.

What cognitive skills would be improved? Attention;Logic & Reasoning;Processing Speed (if timed);Working Memory

What recognition skills would be improved? Counting;Numbers

What is the difficulty level of this activity? 2 of 3.

Published on: 22 May 2022
File size: 280kB (PDF)
Pages size: A4
Interior: Greyscale

Activity answer

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Numbers Ninja 20 This activity was published in Numbers Ninja 20