Flashcards
Whole Numbers
Cards in this deck (28)
- 1Easy Division 963 ÷ 3321
- 2Medium Division 861 ÷ 3
- 3Hard Division 231 ÷ 3
- 4Multiplication grid 35x26
- 5Division with remainder 230÷8
- 6Adding and subtracting decimals 0.0032 + 32.156Line up the decimal points
0.0032
32.1560
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32.1592 - 7Multiplying Decimals 3.25 x 5Ignore decimal point, calculate using grid method (325x5=1625), then count how many numbers there are after the question (3.25 = 2 numbers), have the same amount of numbers after the decimal place in the answer (16.25).
- 8Dividing decimals 6.21 ÷ 3ignore decimals. Calculate as normal using bus stop method. Then put in decimal place
- 9Bus shelter method for division which end do you start?Left hand side
--------------> - 10Multiply and divide by multiples of 10 (eg. x 10, x 100 etc) 6.21 ÷ 10 6.21 x 100
- 11x ÷ two negative numbers e.g. -5 x -2Two negatives make a positive
-5 x -2 = 10 - 12x ÷positive and negative numbers e.g. -5 x 2if the signs don't match = negative
-5 x 2 = -10 - 13Adding or subtracting fractions with same denominator (bottom) e.g. 2/8 + 5/8
- 14Adding or subtracting unlike fractions e.g. 1/2 + 1/3Find a common multiple by multiplying the two denominators. The make equivalent fractions.
- 15Rounding decimals e.g. 3.524 to nearest 10th 3.649 to nearest 100th1. Find the column e.g. 10th
2. look at number to right to see if this column changes: (5 or above then go up by 1, 4 or less stays the same)
3. ignore any numbers after the column
e.g. 3.524 to nearest 10th = 3.5
e.g. 3.649 to nearest 100th = 3.65 - 16Multiplying fractions e.g. 2/5 x 3/4Multiply the top and the bottom
2 x 3 = 6
5 x 4 = 20
and simplify = 3/10 - 17Adding or subtracting unlike fractions e.g. 1/4 + 2/5
- 18Dividing fractions 2/5 ÷ 3/4reverse the sign, reverse the fraction change it to x
flip the 2nd fraction
2/5 x 4/3 - 19Finding Fraction Parts 3/4 of £2020 ÷ 4 X 3
(divide by the bottom and times by the top)
= £15 - 20Expressing one number as a fraction of another number. 3 as a fraction of 30write the part over the whole
3/30 and simplify 1/10 - 21Turn top heavy (improper) fraction into mixed numbers e.g. 8/3Divide top by the bottom = 8 ÷ 3 = 2 (whole number)
with remainder 2. Put the remainder over the bottom of the fraction = 2/3
2 2/3 - 22Mixed number to top-heavy fractions 5 2/4Times the whole number by the bottom of the fraction 5 x 4 = 20
Add the remainder (top part of the fraction) 20 + 2
Put the total over the bottom 22/4 - 23Find %age Part of a number e.g. 37% of £70Break 37% into parts
1. find 10% of £70: 70 ÷ 10 = 7
2. Find 30%: 10% x 3: 7 x 3 = 21
3. Find 5%: 10% ÷ 2: 7 ÷ 2 = 3.5
4. Find 1% of £70: 70 ÷ 100 = 0.7
5. Find 2%: 1% x 2: 0.7 x 2 = 1.4
Add up 30%, 5% & 2% = £25.90 - 24Find %age after deduction/increase e.g. price was £80, sale is 25% off. What is the price now?Find the saving: 25% of £80 = £20
Take the saving from the original price: £80 - £20 = new price: £60 - 25Express one number as a percentage of another number e.g. express 20 as a %age of 80Write it as a fraction: 20/80
Turn it into a decimal by solving it:
20 ÷ 80 = 0.25
Turn it into a %age by x 100
0.25 x 100 = 25% - 26Find 10% of a number e.g. 10% of 8510% = ÷ 10
85 ÷ 10 = 8.5 - 27Find % increase/decrease e.g. A TV cost £300 but in a sale is now £270. What is the %age saving?Difference ÷ original x 100
(300-270)=30 ÷ 300 = 0.1 x 100 = 10
10% saving - 28—
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- GCSE Maths Flashcards on Whole Numbers, created by bradley kewell on 22/09/2017.
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- bradley kewell
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