Drag the numbers into the yellow cells so that the totals along each side of the triangle are the same.
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below.
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This is Tool Triangle level 1. You can also
try:
Level 2
Level 3
Level 4
Level 5
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There is a printable worksheet to go with this activity.
What if there were nine digits to place on the sides of the triangle? See Triside Totals:


Transum.orgThis web site contains over a thousand free mathematical activities for teachers and pupils. Click here to go to the main page which links to all of the resources available. Please contact me if you have any suggestions or questions. 
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Numeracy"Numeracy is a proficiency which is developed mainly in Mathematics but also in other subjects. It is more than an ability to do basic arithmetic. It involves developing confidence and competence with numbers and measures. It requires understanding of the number system, a repertoire of mathematical techniques, and an inclination and ability to solve quantitative or spatial problems in a range of contexts. Numeracy also demands understanding of the ways in which data are gathered by counting and measuring, and presented in graphs, diagrams, charts and tables." Secondary National Strategy, Mathematics at key stage 3 

Go MathsLearning and understanding Mathematics, at every level, requires learner engagement. Mathematics is not a spectator sport. Sometimes traditional teaching fails to actively involve students. One way to address the problem is through the use of interactive activities and this web site provides many of those. The Go Maths main page links to more activities designed for students in upper Secondary/High school.  
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Transum,
Monday, January 6, 2020
"My tip for doing Level 4 and higher levels is to first only consider the units digit, effectively working in mod 10. This makes it easier to find a pattern that works and then it is not too difficult to find the actual solution."