Square numbers When we multiply a number by itself we say that we are squaring the number. To square a number we can write a small 2 after it. For example,

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Presentation transcript:

Square numbers When we multiply a number by itself we say that we are squaring the number. To square a number we can write a small 2 after it. For example, the number 3 multiplied by itself can be written as: Three squared 3 × 3 or 32 Introduce the notation 2 to mean ‘squared’ or ‘to the power of two’. Pupils sometimes confuse ‘to the power of two’ with ‘times by two’. Point out that raising to a power can be thought of as repeated multiplication. The value of three squared is 9. The result of any whole number multiplied by itself is called a square number.

First 10 square numbers 1 x 1 = 1 2 x 2 = 4 3 x 3 = 9 4 x 4 = 16 5 x 5 = 25 6 x 6 = 36 7 x 7 = 49 8 x 8 = 64 9 x 9 = 81 10 x 10 = 100 First 10 cube numbers 1 x 1 x 1 = 1 2 x 2 x 2 = 8 3 x 3 x 3 = 27 4 x 4 x 4 = 64 5 x 5 x 5 = 125 6 x 6 x 6 = 216 7 x 7 x 7 = 343 8 x 8 x 8 = 512 9 x 9 x 9 = 729 10 x 10 x 10 = 1000 15² = 15 x 15 =225 25² = 25 x 25 = 625 22³ = 22 x 22 x 22 = 10648 15³ = 15 x 15 x 15 = 3375

Square roots Finding the square root is the inverse of finding the square: squared 8 64 square rooted Talk through the slide and introduce the square root symbol. Explain that to work out the square root we need to ask ourselves ‘what number multiplied by itself will give this answer’. Does any other number multiply by itself to give 64? Obtain the answer –8. Remember that when you multiply two negative numbers together the answer is positive. Point out that when we use the  symbol we are usually referring to the positive square root. Ask verbally for the square root of some known square numbers. For example: What is the square root of 81? We write: 64 = 8 The square root of 64 is 8.

Negative square roots 5 × 5 = 25 and –5 × –5 = 25 Therefore, the square root of 25 is 5 or –5. When we use the  symbol we usually mean the positive square root. We can also write ± to mean both the positive and the negative square root. The equation, Before revealing –5 × –5 = 25, ask: 5 × 5 = 25, does any other number multiplied by itself give an answer of 25? Explain that the square root symbol refers to the positive square root, by convention. Pupils need to know that the negative square root exists, for example, in the solution to equations such as that shown. Ask for other negative square roots verbally. x2 = 25 has 2 solutions, x = 5 or x = –5.

Square roots We can easily find the square root of a square number. 1 = 1 or -1 36 = 6 or -6 4 = 2 or -2 49 = 7 or -7 9 = 3 or -3 64 = 8 or -8 16 = 4 or -4 81 = 9 or -9 25 = 5 or -5 100 = 10 or -10

Cube roots Finding the cube root is the inverse of finding the cube: cubed 5 125 cube rooted Explain that to find the cube root we need to think ‘what number multiplied by itself twice will give this answer’. We write: 125 = 5 3 The cube root of 125 is 5.