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Bra Size worksheet

Grades 4–5

Solve each problem and show your work. Round answers to 2 decimal places where needed.

1.
Problem 1.
- Measure in: Centimeters
- Underbust: 80 cm
- Bust: 95 cm
Find: US size
Answer
2.
Problem 2.
- Measure in: Centimeters
- Underbust: 68 cm
- Bust: 73 cm
Find: US size
Answer
3.
Problem 3.
- Measure in: Inches
- Underbust: 37 in
- Bust: 40 in
Find: US size
Answer
4.
Problem 4.
- Measure in: Inches
- Underbust: 28 in
- Bust: 32 in
Find: US size
Answer
5.
Problem 5.
- Measure in: Inches
- Underbust: 45 in
- Bust: 54 in
Find: US size
Answer
6.
Problem 6.
- Measure in: Inches
- Underbust: 38 in
- Bust: 40 in
Find: US size
Answer
7.
Problem 7.
- Measure in: Inches
- Underbust: 30 in
- Bust: 36 in
Find: US size
Answer
8.
Problem 8.
- Measure in: Inches
- Underbust: 28 in
- Bust: 34 in
Find: US size
Answer
9.
Problem 9.
- Measure in: Inches
- Underbust: 32 in
- Bust: 34 in
Find: US size
Answer
10.
Problem 10.
- Measure in: Centimeters
- Underbust: 90 cm
- Bust: 95 cm
Find: US size
Answer

Answer key: Bra Size worksheet

1. US size: 32DD
1. Convert both measurements to inches (÷ 2.54), since US and UK band sizes are in inches
  $\frac{80}{2.54} = 31.5 in, \frac{95}{2.54} = 37.4 in$
2. Band: round the underbust to the nearest inch. Bands come in even numbers, so move up to the next one
  $31.5 in$ $= 31$ $= 31 + 1$ $= band 32$
3. Cup: subtract the band from the bust and round to whole inches. Each inch of difference is one cup size
  $37.4 - 32$ $= 5.4$ $= ≈ 5 → cup DD$
4. Convert for other countries. The UK keeps the same band but uses its own letters after D. EU bands are 2.5 × band − 10, in cm. Australian bands are the band minus 22
  $2.5 \times 32 - 10$ $= EU band 70$
5. Put the band and cup together
  $US size$ $= 32DD$
2. US size: 28A
1. Convert both measurements to inches (÷ 2.54), since US and UK band sizes are in inches
  $\frac{68}{2.54} = 26.77 in, \frac{73}{2.54} = 28.74 in$
2. Band: round the underbust to the nearest inch. Bands come in even numbers, so move up to the next one
  $26.77 in$ $= 27$ $= 27 + 1$ $= band 28$
3. Cup: subtract the band from the bust and round to whole inches. Each inch of difference is one cup size
  $28.74 - 28$ $= 0.74$ $= ≈ 1 → cup A$
4. Convert for other countries. The UK keeps the same band but uses its own letters after D. EU bands are 2.5 × band − 10, in cm. Australian bands are the band minus 22
  $2.5 \times 28 - 10$ $= EU band 60$
5. Put the band and cup together
  $US size$ $= 28A$
3. US size: 38B
1. Band: round the underbust to the nearest inch. Bands come in even numbers, so move up to the next one
  $37 in$ $= 37$ $= 37 + 1$ $= band 38$
2. Cup: subtract the band from the bust and round to whole inches. Each inch of difference is one cup size
  $40 - 38$ $= 2$ $= ≈ 2 → cup B$
3. Convert for other countries. The UK keeps the same band but uses its own letters after D. EU bands are 2.5 × band − 10, in cm. Australian bands are the band minus 22
  $2.5 \times 38 - 10$ $= EU band 85$
4. Put the band and cup together
  $US size$ $= 38B$
4. US size: 28D
1. Band: round the underbust to the nearest inch. Bands come in even numbers, and this one already is
  $28 in$ $= band 28$
2. Cup: subtract the band from the bust and round to whole inches. Each inch of difference is one cup size
  $32 - 28$ $= 4$ $= ≈ 4 → cup D$
3. Convert for other countries. The UK keeps the same band but uses its own letters after D. EU bands are 2.5 × band − 10, in cm. Australian bands are the band minus 22
  $2.5 \times 28 - 10$ $= EU band 60$
4. Put the band and cup together
  $US size$ $= 28D$
5. US size: 46H
1. Band: round the underbust to the nearest inch. Bands come in even numbers, so move up to the next one
  $45 in$ $= 45$ $= 45 + 1$ $= band 46$
2. Cup: subtract the band from the bust and round to whole inches. Each inch of difference is one cup size
  $54 - 46$ $= 8$ $= ≈ 8 → cup H$
3. Convert for other countries. The UK keeps the same band but uses its own letters after D. EU bands are 2.5 × band − 10, in cm. Australian bands are the band minus 22
  $2.5 \times 46 - 10$ $= EU band 105$
4. Put the band and cup together
  $US size$ $= 46H$
6. US size: 38B
1. Band: round the underbust to the nearest inch. Bands come in even numbers, and this one already is
  $38 in$ $= band 38$
2. Cup: subtract the band from the bust and round to whole inches. Each inch of difference is one cup size
  $40 - 38$ $= 2$ $= ≈ 2 → cup B$
3. Convert for other countries. The UK keeps the same band but uses its own letters after D. EU bands are 2.5 × band − 10, in cm. Australian bands are the band minus 22
  $2.5 \times 38 - 10$ $= EU band 85$
4. Put the band and cup together
  $US size$ $= 38B$
7. US size: 30DDD
1. Band: round the underbust to the nearest inch. Bands come in even numbers, and this one already is
  $30 in$ $= band 30$
2. Cup: subtract the band from the bust and round to whole inches. Each inch of difference is one cup size
  $36 - 30$ $= 6$ $= ≈ 6 → cup DDD$
3. Convert for other countries. The UK keeps the same band but uses its own letters after D. EU bands are 2.5 × band − 10, in cm. Australian bands are the band minus 22
  $2.5 \times 30 - 10$ $= EU band 65$
4. Put the band and cup together
  $US size$ $= 30DDD$
8. US size: 28DDD
1. Band: round the underbust to the nearest inch. Bands come in even numbers, and this one already is
  $28 in$ $= band 28$
2. Cup: subtract the band from the bust and round to whole inches. Each inch of difference is one cup size
  $34 - 28$ $= 6$ $= ≈ 6 → cup DDD$
3. Convert for other countries. The UK keeps the same band but uses its own letters after D. EU bands are 2.5 × band − 10, in cm. Australian bands are the band minus 22
  $2.5 \times 28 - 10$ $= EU band 60$
4. Put the band and cup together
  $US size$ $= 28DDD$
9. US size: 32B
1. Band: round the underbust to the nearest inch. Bands come in even numbers, and this one already is
  $32 in$ $= band 32$
2. Cup: subtract the band from the bust and round to whole inches. Each inch of difference is one cup size
  $34 - 32$ $= 2$ $= ≈ 2 → cup B$
3. Convert for other countries. The UK keeps the same band but uses its own letters after D. EU bands are 2.5 × band − 10, in cm. Australian bands are the band minus 22
  $2.5 \times 32 - 10$ $= EU band 70$
4. Put the band and cup together
  $US size$ $= 32B$
10. US size: 36A
1. Convert both measurements to inches (÷ 2.54), since US and UK band sizes are in inches
  $\frac{90}{2.54} = 35.43 in, \frac{95}{2.54} = 37.4 in$
2. Band: round the underbust to the nearest inch. Bands come in even numbers, so move up to the next one
  $35.43 in$ $= 35$ $= 35 + 1$ $= band 36$
3. Cup: subtract the band from the bust and round to whole inches. Each inch of difference is one cup size
  $37.4 - 36$ $= 1.4$ $= ≈ 1 → cup A$
4. Convert for other countries. The UK keeps the same band but uses its own letters after D. EU bands are 2.5 × band − 10, in cm. Australian bands are the band minus 22
  $2.5 \times 36 - 10$ $= EU band 80$
5. Put the band and cup together
  $US size$ $= 36A$