Y7 Mental Arithmetic

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Across
  1. 4. This is the result you get when you divide one number by another. For example, the quotient of 8 ÷ 2 is 4.
  2. 5. This tells you how many times to multiply a number by itself. For example, in 2^3, 3 is the power, meaning 2 is multiplied by itself 3 times.
  3. 9. This means adjusting a number to be closer to a round number or to a specific place value. For example, rounding 67 to the nearest ten gives you 70.
  4. 12. This means you can swap numbers around when adding or multiplying and still get the same answer. For example, 4 + 5 is the same as 5 + 4.
  5. 14. This is just the plural of index. It means more than one index or exponent.
  6. 15. This is a set of rules that tells you which calculations to do first in a math problem. A common way to remember this is PEMDAS (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction).
  7. 16. These are numbers that you can get by multiplying a whole number by itself three times. For example, 8 is a perfect cube because 2 x 2 x 2 = 8.
  8. 18. In math, the base is the number that gets multiplied when using exponents. For example, in 3^4, 3 is the base and it means 3 is multiplied by itself 4 times.
  9. 19. This is the number you are dividing up. For example, in 15 ÷ 3, 15 is the dividend.
  10. 21. This means making a smart guess about a number or result. It's like rounding to a simpler number to make math easier.
  11. 22. Form: This shows a number as the sum of its parts. For example, 345 in expanded form is 300 + 40 + 5.
Down
  1. 1. This is the number you are dividing by. In 15 ÷ 3, 3 is the divisor.
  2. 2. This rule lets you multiply a number by a group of numbers added together. For example, 2 x (3 + 4) is the same as (2 x 3) + (2 x 4).
  3. 3. In math, this is another way to talk about the power or exponent. It tells you how many times to multiply the base by itself.
  4. 6. This is a fancy way of saying that it doesn't matter how you group numbers when you're adding or multiplying them. For example, (2 + 3) + 4 is the same as 2 + (3 + 4).
  5. 7. This is a number that, when multiplied by itself, gives you the original number. For example, the square root of 25 is 5, because 5 x 5 = 25.
  6. 8. This is a number that, when multiplied by itself three times, gives you the original number. For example, the cube root of 27 is 3, because 3 x 3 x 3 = 27.
  7. 10. These are numbers that you can get by multiplying a whole number by itself. For example, 16 is a perfect square because 4 x 4 = 16.
  8. 11. This is what is left over after dividing. For example, in 10 ÷ 3, 1 is the remainder because 3 goes into 10 three times, with 1 left over.
  9. 13. This is the answer you get when you multiply numbers together. For example, the product of 3 and 4 is 12.
  10. 17. Conventions: These are the agreed-upon rules and ways we do math, like always doing multiplication before addition.
  11. 20. This is a way of writing numbers using bases and exponents. For example, 2^3 is the index form, showing 2 is the base and 3 is the index.