Grade 6

Powers and primes

Exponents and prime factors. Part of below zero and beyond.

Powers and primes

Exponents and prime factors · Alberta Grade 6 · maddyhelps.com

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Work out each power. Write each multiplication as a power. Circle the primes. Then break each number into prime factors with a factor tree, and write the answer using powers.

2⁴ =

3³ =

5² =

10⁴ =

4³ =

1⁹ =

6 × 6 × 6 =

2 × 2 × 2 × 2 × 2 × 2 =

10 × 10 =

Circle the primes: 2 9 13 21 29 51 57 61

For the grown-up

Powers and primes

2⁴ = 16, 3³ = 27, 5² = 25, 10⁴ = 10 000, 4³ = 64, 1⁹ = 1. 6³, 2⁶, 10². Primes: 2, 13, 29, 61; 9 = 3 × 3, 21 = 3 × 7, 51 = 3 × 17, 57 = 3 × 19. 36 = 2² × 3²; 60 = 2² × 3 × 5; 84 = 2² × 3 × 7; 90 = 2 × 3² × 5.

51 and 57 look prime and are not — both divide by 3, because their digits add to a multiple of 3. And 1⁹ is 1: multiplying 1 by itself never gets anywhere.

Why this matters is on the below zero and beyond page. More sheets