16. Count on by 10 from 245:
A. 255
B. 250
C. 245
D. 275
Answer: A
Explanation: 245 + 10 = 255.
17. Count back by 5 from 80:
A. 85
B. 75
C. 70
D. 65
Answer: B
Explanation: 80 – 5 = 75.
18. Count on by 100 from 4,500:
A. 4,400
B. 4,600
C. 5,000
D. 4,550
Answer: B
Explanation: 4,500 + 100 = 4,600.
19. Count back by 1,000 from 9,250:
A. 8,250
B. 9,150
C. 8,200
D. 9,050
Answer: A
Explanation: 9,250 – 1,000 = 8,250.
20. Count on by 2 from 37:
A. 35
B. 38
C. 39
D. 40
Answer: C
Explanation: 37 + 2 = 39.
21. If you start at 600 and count back by 50 twice, you land on:
A. 550
B. 500
C. 450
D. 600
Answer: B
Explanation: 600 – 50 = 550; 550 – 50 = 500.
22. Count on by 25 from 300:
A. 325
B. 315
C. 350
D. 375
Answer: A
Explanation: 300 + 25 = 325.
23. Count back by 200 from 1,000:
A. 800
B. 850
C. 900
D. 750
Answer: A
Explanation: 1,000 – 200 = 800.
