Free · Ready to print · Letter & A4
Surface area formulas
Need a surface area formulas within reach? Print it for the wall, then hand off to the practice sheets below.
- Letter & A4 ready
- Nothing to fill in
- Reprint it any time
Reference chart
Surface area formulas
Cube
6 × s × s
6 × 16 = 96
Box
2(lw + lh + wh)
2(10 + 15 + 6) = 62
Prism
2 × base + P × height
2(12) + 16 × 5 = 104
Cylinder
2 π r² + 2 π r h
56 + 188 = 244
Cone
π r² + π r l
28 + 47 = 75
Sphere
4 × π × r × r
4 × 3.14 × 25 = 314
Surface area is the wrapping — every face added up, so it stays in sq cm even though the shape is solid. Unfold the solid in your head and add the flat pieces.
What's on this chart
Surface area is the one topic where the formula is genuinely harder than the idea. Every child understands "how much wrapping paper"; almost none can see where 2πr² + 2πrh came from. So the cube and the cylinder are drawn flat here — unfolded into the pieces you would actually add — and once a cylinder is a rectangle between two circles, the formula stops being something to memorise and becomes something to read off the picture.
Why this chart helps
The rectangle in that net is the part worth pointing at. Its height is the cylinder's height, and its width is the circumference of the circle it was rolled around — because that is the distance the roll goes. A child who unrolls a label off a tin has done this, and the chart is only naming what they did.
More printable charts
Multiplication table Child does: Read a row across and a column down to the square where they meet. Print this chart 
Addition table Child does: Follow a row and a column to the square where the two numbers meet. Print this chart 
Subtraction table Child does: Start on the number being taken from, then read across to what is taken away. Print this chart 
Division table Child does: Find the family being divided by, then read down it to the answer. Print this chart 
Hundreds chart Child does: Count, skip count, or add ten by moving one square straight down. Print this chart 
Number bonds to 10 Child does: Read each row of counters and say the two numbers that make ten. Print this chart 
Fraction wall Child does: Line two rows up to see which fractions are the same width. Print this chart 
Place value chart Child does: Put each digit in its column and read what that digit is worth. Print this chart 
Number line 0–20 Child does: Count on or back by hopping along the line one number at a time. Print this chart 
Prime numbers to 50 Child does: Check whether a number is marked before trying to break it into factors. Print this chart 
Prime numbers to 100 Child does: Find the primes on the grid and see the pattern the multiples leave behind. Print this chart 
Prime numbers to 150 Child does: Look a number up on the grid instead of testing it for factors. Print this chart 
Prime numbers to 200 Child does: Tell a prime from a composite at a glance while factoring or simplifying. Print this chart 
Factors chart Child does: Read off every factor of a number before simplifying or finding a common one. Print this chart 
Divisibility rules Child does: Run one quick test in their head instead of starting a division. Print this chart 
Fraction, decimal & percent Child does: Swap the same amount between a fraction, a decimal, and a percent. Print this chart 
Fraction rules Child does: Check a fraction answer against the rule before doing the arithmetic. Print this chart 
Roman numerals Child does: Build or read a numeral using the seven symbols and the three rules. Print this chart 
Measurement conversions Child does: Look the conversion up, then decide whether to multiply or divide. Print this chart 
Multiplication table 1–20 Child does: Look up a fact past the twelves without working it out. Print this chart 
Squares and cubes Child does: Read off a square or a cube instead of multiplying it out. Print this chart 
Multiples chart Child does: Run a finger along two rows until the same number appears in both. Print this chart 
Number bonds to 20 Child does: Count the two colors in a row and say the pair that makes twenty. Print this chart 
Decimal place value Child does: Place a digit in its column and read what the digit is worth. Print this chart 
Telling the time Child does: Read the hour inside the dial and the minutes printed outside it. Print this chart 
Order of operations Child does: Work down the ranks, taking each one left to right before the next. Print this chart 
Positive and negative numbers Child does: Check which operation you are doing before deciding the answer's sign. Print this chart 
Rounding rules Child does: Find the place, look at the digit beside it, then decide. Print this chart 
Mental math tricks Child does: Swap the hard number for an easy one before you start calculating. Print this chart 
Perimeter formulas Child does: Follow the traced edge on the figure, then read the formula under it. Print this chart 
Area formulas Child does: Match your shape to a figure and use the letters drawn on it. Print this chart 
Volume formulas Child does: Find your solid, then multiply the base area by how tall it stands. Print this chart