Divisibility
Understand exact divisibility and use the ones digit to test divisibility by 2, 5 and 10, including the relationship between the three tests.
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Divisibility Meaning and Tests for 2, 5 and 10
Understand exact divisibility and use the ones digit to test divisibility by 2, 5 and 10, including the relationship between the three tests.
Open article →Digit-Sum Divisibility Tests for 3 and 9
Add the digits, repeat the sum when useful, and decide divisibility by 3 or 9 while understanding why the test for 9 also implies divisibility by 3.
Open article →Last-Digit Block Tests for Divisibility by 4 and 8
Test divisibility by 4 from the last two digits and by 8 from the last three digits, including the all-zero endings and place-value reason.
Open article →Combined Divisibility Test for 6 and the Case of 7
Combine the tests for 2 and 3 to decide divisibility by 6, understand why both conditions are necessary, and apply the textbook’s direct-division advice for 7.
Open article →Divisibility by 11 and a Complete Rule Checklist
Form alternating-position digit sums, test their difference for 0 or a multiple of 11, and consolidate every supported divisibility rule without mixing criteria.
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