Page 83 - Math Smart - 7

O Ava has a piece of green ribbon that is 2.04 m long and a piece of red ribbon
that is 230 cm long. How much longer is the red ribbon in metres?

2 1 Remember to convert
wv* to the same unit of
2 0
-2.04
measurement.
-l/i
0 .26
The red ribbon is 0.26 m longer than the green ribbon.

Speed Challenge

How many can you work out correctly in 5 minutes?
Ready, set, go!

o

1. 47.2-10.7 = 1. 86.52-7.39 = 1. 17.51-16.6 =
2. 34.1 -23.0 = 2. 24.66 + 22.75 = 2. 25.08+ 18.7 =
3. 43.7-38.4 = 3. 62.88 + 25.33 = 3. 77.16+18.6 =
4. 30.5 + 14.8 = 4. 93.64-9.09 = 4. 49.19 + 3.64 =
5. 44.24-7.4 =
5. 36.2-35.7 = 5. 55.41 +28.51 =
6. 94.7-8.4 = 6. 12.28 + 10.45 = 6. 28.29-25.92 =
7. 20.7-20.3 = 7. 65.08-15.48 = 7. 93.73-0.6 =
8. 74.1 +21.6 = 8. 74.17 + 9.48 = 8. 99.65-28.79 =
9. 73.8 + 40.9 = 9. 54.46 + 8.19 = 9. 36.42-4.2 =
10. 48.0-45.5 = 10. 57.18 + 27.35 = 10. 74.4 + 27.16 =

• Number of • Number of • Number of
questions answered questions answered questions answered
in 5 min = in 5 min = in 5 min =

Exchange books with your classmate for peer marking. Write the score for each challenge.
• Were you able to find the sums or differences faster?
• Did you get more accurate?