K12worX
Back to Number Patterns and Sequences — Problem 3 · Task Set 16

Exercises: Number Patterns and Sequences

Work through each section in order. Show your work where indicated. For arithmetic sequences, use the nth-term formula $a + (n-1)d$.

Grade 7·18 problems·~30 min·Uganda NCDC Primary 7 Mathematics·lesson·patterns-03
Work through problems with immediate feedback
A

Fluency Practice

Four triangular dot patterns with 1, 3, 6, and 10 dots, showing the triangular number sequence.
1.

The dot patterns below show the triangular numbers 1,3,6,10,…1, 3, 6, 10, \ldots. What is the next triangular number after 1010?