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Back to Types of Numbers: Composite, Square, Cubic, and Triangular — Problem 4 · Task Set 15

Exercises: Types of Numbers — Composite, Square, Cubic, and Triangular

Work through each section in order. Show your work where indicated.

Grade 7·19 problems·~30 min·Uganda NCDC Primary 7 Mathematics·lesson·patterns-02
Work through problems with immediate feedback
A

Fluency Practice

Four growing triangular dot arrangements of 1, 3, 6, and 10 dots
1.

The dot triangles below show T1,T2,T3,T4T_1, T_2, T_3, T_4 with 1, 3, 6, 10 dots. What is the fifth triangular number, T5T_5?