Strategies, sixes and sevens, and elapsed time
Answers are for parents and teachers.
1
Add 534 + 289 with a strategy and check your answer.
500 + 200 = 700, 30 + 80 = 110 and 4 + 9 = 13. Total: 700 + 110 + 13 = 823. Check: 823 − 289 = 534.
2
Subtract 700 − 358 by counting up.
358 to 400 is 42, and 400 to 700 is 300. So 700 − 358 = 342. Check: 342 + 358 = 700.
3
Find 6 × 9 and 7 × 6. Tell how you found them.
6 × 9 = 54 (for example 6 × 10 = 60 and 60 − 6 = 54). 7 × 6 = 42 (7 × 5 = 35 and 35 + 7 = 42).
4
Two dice show the dots in the picture. Add them and multiply the sum by 7.
The dice show 5 and 6. The sum is 11 and 11 × 7 = 77.
5
A bus trip starts at 7:40 a.m. and ends at 12:10 p.m. How long is the trip?
7:40 to 8:00 is 20 minutes, 8:00 to 12:00 is 4 hours and 12:00 to 12:10 is 10 minutes. The trip is 4 hours 30 minutes.