Singapore Math Level 2A & 2B – Unit 8: Length
Examples:
1.
What is the length of the card shown above?
12 – 3 = 9
The length of the card is 9 cm.
2. Charlotte walked 345 yd. to a café.
She walked another 150 yd. to the park. How far did she walk in all?
345 + 150 = 495
She walked 495 yd. in all.
3. Fanny sews 4 pieces of ribbon to each side of a square cushion.
If she uses 36 cm of ribbon altogether, what is the length of each piece of ribbon?
36 ÷ 4 = 9
The length of each piece of ribbon is 9 cm.
Write more or less on the lines.
1. The height of a flagpole is ____ than 1 m.
2. The length of a box of tissues is ____ than 1 m.
3. The length of a pencil is ____ than 1 m.
4. The height of a four-story school is ____ than 1 m.
5. The length of a workbook is ____ than 1 m.
Solution(1-5):
1. more
2. less
3. less
4. more
5. less
Fill in each blank with the correct answer.
6.
(a) Ribbon …… is the shortest.
(b) Ribbon ….. is the longest.
(c) Ribbon A is …… yd. shorter than Ribbon C.
(d) Ribbon C is ……. yd. shorter than Ribbon B.
(e) Ribbon B is …….. yd. longer than Ribbon C.
(f) Ribbon B is …….. yd. longer than Ribbon A.
Solution(6):
(a) A
(b) B
(c) 4 yd. – 2 yd. = 2 yd.
(d) 6 yd. – 4 yd. = 2 yd.
(e) 6 yd. – 4 yd. = 2 yd.
(f) 6 yd. – 2 yd. = 4 yd.
7.
(a) Window ……. is the tallest.
(b) Window ….. is the shortest.
(c) Window A is …… m shorter than Window C.
(d) Window B is ……. m shorter than Window A.
(e) Window C is ……. m taller than Window B.
(f) Window C is ……… m taller than Window A.
Solution(7):
(a) C
(b) B
(c) 5 m – 3 m = 2 m
(d) 3 m – 1 m = 2 m
(e) 5 m – 1 m = 4 m
(f) 5 m – 3 m = 2 m
8. Use a ruler to draw a line 4-in. long. Label it XY.
Solution(8):
1. Place a ruler on the paper.
2. Draw a line from 0 to 4 with a pencil along the inch scale on the ruler.
3. Mark one end of the resulting line with X and the other end with Y.
4. So, using the ruler, a 4-inch line marked XY is drawn.
9. Use a ruler to draw a line 6-in. long. Label it WX.
Solution(9):
1. Place a ruler on the paper.
2. Draw a line from 0 to 6 with a pencil along the inch scale on the ruler.
3. Mark one end of the resulting line with W and the other end with X.
4. So, using the ruler, a 6-inch line marked WX is drawn.
10. Use a ruler to draw a line 5-in. long. Label it YZ.
Solution(10):
1. Place a ruler on the paper.
2. Draw a line from 0 to 5 with a pencil along the inch scale on the ruler.
3. Mark one end of the resulting line with Y and the other end with z.
4. So, using the ruler, a 5-inch line marked YZ is drawn.
Measure the following items with a ruler, and answer questions 11 to 14.
11.
The pen is _._._._ cm long.
12.
The envelope is _._._._ cm long.
13.
The notebook is _._._._._ cm wide.
14.
The calculator is __.__ cm wide.
Solution(11-14):
11. 5
12. 3
13. 4
14. 2
Fill in each blank with longer than or shorter than.
15. A _________ B _______________
Line B is ________ Line A.
16. A ____________ B _____
Line A is ________ Line B.
17. A _____ B ___________
Line A is ________ Line B.
Solution(15-17):
15. longer than
16. longer than
17. shorter than
18. Study the picture carefully. Fill in each blank with the correct answer.
(a) The stapler is …. cm long.
(b) The eraser is ….. cm long.
(c) The bottle of glue is …… cm long.
(d) The pencil is ……. cm long.
(e) The eraser is ……. cm shorter than the pencil.
(f) The stapler is …….. cm longer than the bottle of glue.
(g) The longest item is the __.___.
(h) The shortest item is the __.___.
Solution(18):
(a) 9 cm – 2 cm = 7 cm
(b) 13 cm – 10 cm = 3 cm
(c) 11 cm – 6 cm = 5 cm
(d) 10 cm – 0 cm = 10 cm
(e) 10 cm – 3 cm = 7 cm
(f) 7 cm – 5 cm = 2 cm
(g) pencil
(h) eraser
19.
(a) Ribbon A is …. in. long.
(b) Ribbon B is ….. in. long.
(c) Ribbon C is …… in. long.
(d) Ribbon D is …… in. long.
(e) Ribbon ……. is the longest.
(f) Ribbon …….. is the shortest.
(g) Ribbon C is ……… in. longer than Ribbon A.
(h) Ribbon D is 3 in. shorter than Ribbon ….…
Solution(19):
(a) 8 in. – 0 in. = 8 in.
(b) 5 in. – 0 in. = 5 in.
(c) 12 in. – 0 in. = 12 in.
(d) 9 in. – 0 in. = 9 in.
(e) C
(f) B
(g) 12 in. – 8 in. = 4 in.
(h) C
9 in. + 3 in. = 12 in.
Fill in each blank with the correct answer.
20. 38 in. + 78 in.=______ in.
21. 125 cm – 89 cm=_____ cm
22. 236 yd. + 279 yd.=____ yd.
23. 468 cm – 318 cm=____cm
24. 200 yd. – 65 yd.=____ yd.
25. 399 m + 121 m=_____m
Solution(20-25):
20. 116
21. 36
22. 515
23. 150
24. 135
25. 520
Solve the following story problems. Show your work in the space below. Draw the appropriate models.
26. Miles sewed 278 in. of curtains on Monday. He sewed 516 in. of curtains on Tuesday. Find the total length (in.) of curtains Miles sewed on both days.
The total length of curtains Miles sewed on both days was ___ in.
Solution(26):
278 + 516 = 794
The total length of curtains Miles sewed on both days was 794 in.
27.
After school, Rosie goes to the grocery store to buy some milk before going home. How far does she travel?
Solution(27):
120 + 225 = 345
She travels 345 m.
28. The stadium is 350 yd. away from Samir’s house. Samir jogs to the stadium and back to his house. How far does he jog?
He jogs ____ yd.
Solution(28):
350 + 350 = 700
He jogs 700 yd.
29. Kate has a piece of ribbon 26 cm long. June has a piece of ribbon that is 13 cm shorter than Kate’s ribbon.
(a) What is the length of June’s ribbon?
June’s ribbon is ____ cm long.
(b) Find the total length of the 2 ribbons.
The total length of the 2 ribbons is ____ cm long.
Solution(29):
(a)
26 – 13 = 13
June’s ribbon is 13 cm long.
(b)
26 + 13 = 39
The total length of the 2 ribbons is 39 cm long.
30. Nicholas placed 3 boxes side by side. The length of each box was 10 in. What was the length of the 3 boxes?
The length of the 3 boxes was ____ in.
Solution(30):
3 × 10 = 30
The length of the 3 boxes was 30 in.
31. Juan placed 8 toothpicks along a straight line. The length of each toothpick was 5 cm. What was the length of 8 toothpicks?
The length of 8 toothpicks was ____ cm.
Solution(31):
8 × 5 = 40
The length of 8 toothpicks was 40 cm.
32. Mr. Oliver cuts a rope that is 6 ft. long into 2 equal pieces. What is the length of each piece of rope?
The length of each piece of rope is _____ ft.
Solution(32):
6÷2=3
The length of each piece of rope is 3 ft.
33. Leo tears a strip of paper that is 27 cm long into equal pieces. Each piece of paper measures 3 cm. How many pieces of paper does Leo have?
Leo has _____ pieces of paper.
Solution(33):
27 ÷ 3 = 9
Leo has 9 pieces of paper.
34. The length of a piece of string is 32 in. Gabrielle cuts the string into equal pieces. Each piece of string measures 4 in. How many pieces of string does Gabrielle have?
Gabrielle has ____ pieces of string.
Solution(34):
32 ÷ 4 = 8
Gabrielle has 8 pieces of string.
