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Child Height Predictor worksheet

Grades 5–6

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

1.
Problem 1.
- Units: Centimeters
- Child's sex: Boy
- Mother's height: 220 cm
- Father's height: 200 cm
Find: Estimated adult height
Answer
2.
Problem 2.
- Units: Centimeters
- Child's sex: Girl
- Mother's height: 180 cm
- Father's height: 225 cm
Find: Estimated adult height
Answer
3.
Problem 3.
- Units: Feet and inches
- Child's sex: Boy
- Mother's height: feet: 4
- Mother's height: inches: 3
- Father's height: feet: 5
- Father's height: inches: 10
Find: Estimated adult height
Answer
4.
Problem 4.
- Units: Centimeters
- Child's sex: Girl
- Mother's height: 225 cm
- Father's height: 150 cm
Find: Estimated adult height
Answer
5.
Problem 5.
- Units: Centimeters
- Child's sex: Girl
- Mother's height: 180 cm
- Father's height: 220 cm
Find: Estimated adult height
Answer
6.
Problem 6.
- Units: Feet and inches
- Child's sex: Boy
- Mother's height: feet: 5
- Mother's height: inches: 4
- Father's height: feet: 4
- Father's height: inches: 9
Find: Estimated adult height
Answer
7.
Problem 7.
- Units: Centimeters
- Child's sex: Girl
- Mother's height: 170 cm
- Father's height: 140 cm
Find: Estimated adult height
Answer
8.
Problem 8.
- Units: Centimeters
- Child's sex: Boy
- Mother's height: 120 cm
- Father's height: 190 cm
Find: Estimated adult height
Answer
9.
Problem 9.
- Units: Centimeters
- Child's sex: Boy
- Mother's height: 160 cm
- Father's height: 140 cm
Find: Estimated adult height
Answer
10.
Problem 10.
- Units: Feet and inches
- Child's sex: Boy
- Mother's height: feet: 6
- Mother's height: inches: 3
- Father's height: feet: 6
- Father's height: inches: 8
Find: Estimated adult height
Answer

Answer key: Child Height Predictor worksheet

1. Estimated adult height: 216.5 cm
1. For a boy, add the parents' heights plus 13 cm (the typical gap between men and women), then halve it
  $\frac{220 + 200 + 13}{2}$ $= 216.5 cm$
2. Most children end up within 8.5 cm either side, so that gives the target range
  $216.5 ± 8.5$ $= 208.0 to 225.0 cm$
2. Estimated adult height: 196 cm
1. For a girl, add the parents' heights minus 13 cm (the typical gap between men and women), then halve it
  $\frac{180 + 225 - 13}{2}$ $= 196 cm$
2. Most children end up within 8.5 cm either side, so that gives the target range
  $196 ± 8.5$ $= 187.5 to 204.5 cm$
3. Estimated adult height: 5 ft 3.1 in
1. Convert the mother's height to centimeters (1 in = 2.54 cm)
  $4 \times 12 + 3 \times 2.54$ $= 129.54 cm$
2. Convert the father's height the same way
  $5 \times 12 + 10 \times 2.54$ $= 177.8 cm$
3. For a boy, add the parents' heights plus 13 cm (the typical gap between men and women), then halve it
  $\frac{129.54 + 177.8 + 13}{2}$ $= 160.17 cm$
4. Most children end up within 8.5 cm either side, so that gives the target range
  $160.17 ± 8.5$ $= 151.7 to 168.7 cm$
5. Change back to feet and inches: divide by 2.54 for inches, then 12 inches make a foot
  $\frac{160.17 cm}{2.54}$ $= 63.06 in$ $= 5 ft 3.1 in$
4. Estimated adult height: 181 cm
1. For a girl, add the parents' heights minus 13 cm (the typical gap between men and women), then halve it
  $\frac{225 + 150 - 13}{2}$ $= 181 cm$
2. Most children end up within 8.5 cm either side, so that gives the target range
  $181 ± 8.5$ $= 172.5 to 189.5 cm$
5. Estimated adult height: 193.5 cm
1. For a girl, add the parents' heights minus 13 cm (the typical gap between men and women), then halve it
  $\frac{180 + 220 - 13}{2}$ $= 193.5 cm$
2. Most children end up within 8.5 cm either side, so that gives the target range
  $193.5 ± 8.5$ $= 185.0 to 202.0 cm$
6. Estimated adult height: 5 ft 3.1 in
1. Convert the mother's height to centimeters (1 in = 2.54 cm)
  $5 \times 12 + 4 \times 2.54$ $= 162.56 cm$
2. Convert the father's height the same way
  $4 \times 12 + 9 \times 2.54$ $= 144.78 cm$
3. For a boy, add the parents' heights plus 13 cm (the typical gap between men and women), then halve it
  $\frac{162.56 + 144.78 + 13}{2}$ $= 160.17 cm$
4. Most children end up within 8.5 cm either side, so that gives the target range
  $160.17 ± 8.5$ $= 151.7 to 168.7 cm$
5. Change back to feet and inches: divide by 2.54 for inches, then 12 inches make a foot
  $\frac{160.17 cm}{2.54}$ $= 63.06 in$ $= 5 ft 3.1 in$
7. Estimated adult height: 148.5 cm
1. For a girl, add the parents' heights minus 13 cm (the typical gap between men and women), then halve it
  $\frac{170 + 140 - 13}{2}$ $= 148.5 cm$
2. Most children end up within 8.5 cm either side, so that gives the target range
  $148.5 ± 8.5$ $= 140.0 to 157.0 cm$
8. Estimated adult height: 161.5 cm
1. For a boy, add the parents' heights plus 13 cm (the typical gap between men and women), then halve it
  $\frac{120 + 190 + 13}{2}$ $= 161.5 cm$
2. Most children end up within 8.5 cm either side, so that gives the target range
  $161.5 ± 8.5$ $= 153.0 to 170.0 cm$
9. Estimated adult height: 156.5 cm
1. For a boy, add the parents' heights plus 13 cm (the typical gap between men and women), then halve it
  $\frac{160 + 140 + 13}{2}$ $= 156.5 cm$
2. Most children end up within 8.5 cm either side, so that gives the target range
  $156.5 ± 8.5$ $= 148.0 to 165.0 cm$
10. Estimated adult height: 6 ft 8.1 in
1. Convert the mother's height to centimeters (1 in = 2.54 cm)
  $6 \times 12 + 3 \times 2.54$ $= 190.5 cm$
2. Convert the father's height the same way
  $6 \times 12 + 8 \times 2.54$ $= 203.2 cm$
3. For a boy, add the parents' heights plus 13 cm (the typical gap between men and women), then halve it
  $\frac{190.5 + 203.2 + 13}{2}$ $= 203.35 cm$
4. Most children end up within 8.5 cm either side, so that gives the target range
  $203.35 ± 8.5$ $= 194.8 to 211.8 cm$
5. Change back to feet and inches: divide by 2.54 for inches, then 12 inches make a foot
  $\frac{203.35 cm}{2.54}$ $= 80.06 in$ $= 6 ft 8.1 in$