Back to Exercise: Find all factor pairs for a whole number in the range 1-100

Exercises: Factor Pairs, Multiples, Primes, and Composites

Work through each section in order. When a problem asks for all factor pairs, test every
number in order starting from 1, and stop once the factors begin to repeat.

Grade 4·23 problems·~33 min·Common Core Math - Grade 4·standard·4-oa-b-4

Work through problems with immediate feedback

Recall / Warm-Up

Compute 24 / 4.

Compute 5 x 9.

Compute 8 x 9.

Fluency Practice

How many factor pairs does 28 have?

Find all factor pairs of 40 by testing every number in order: 1 x 40, 2 x ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ,
4 x ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ , 5 x ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ .

partner of 2:

partner of 4:

partner of 5:

Is 6 a factor of 42?

Yes -- 42 / 6 = 7 with no remainder.

No -- 42 / 6 leaves a remainder.

Is 45 a multiple of 8?

No -- 45 / 8 = 5 remainder 5, not a whole number.

Yes -- 45 / 8 is a whole number.

How many factor pairs does 48 have?

Use the digit-sum rule to check whether 84 is divisible by 3. Digit sum: 8 + 4 =
̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ . Is 84 divisible by 3? Answer ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ (yes or no).

digit sum:

divisible by 3?:

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