Cube

Week 3

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WALT: use a formula to problem solve

Algebra: Work out the missing number

Work out the correct value of the letter X in these number statements: (The first one has been done for you)

1. 5 + X = 10 X = 5
2. 6 + X = 12 X =
3. 10 - X = 5 X =
4. 12 - X = 6 X =
5. 20 - X = 15 X =

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Algebra: Work out the missing number

Work out the correct value of the letter n in these number statements: (The first one has been done for you)

1. 5n + 5 = 30 n = 5 (because 5 x 5 = 25 + 5 = 30)
2. 6n + 10 = 22 n =
3. 10n - 10 = 40 n =
4. 12n - 8 = 16 n=
5. 20n - 15 = 45 n=

Using a formula:

If a = 4, b = 5, c = 6 and d = 7

Calculate the answers to these: (the first one has been done for you)

1. a + b + c = 15 (because 4 + 5 + 6 = 15)
2. 2c + d =
3. 3a + 2b =
4. 4a - 4 =
5. 5d x 2 =
6. 6c - 6 =

Number Sequences:

These sequences are created using a formula including ‘n’ which means any number. For the 1^st number n = 1, for the 2^nd number n = 2 and so on. For each sequence, work out the 6^th, 15^th, 21^st and 100^th number on the sequence.

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