Numbers: Up to 100

A. 12 ✓

A year is defined as the time it takes Earth to complete one full orbit around the sun, which equals exactly 12 months (January through December).

Why the others are wrong:
- B. 11 – Too few; we'd be missing a month
- C. 13 – Too many; the calendar has never had 13 months in standard use
- D. 14 – Too many; this doesn't match any calendar system

A. 10 is correct. One ten equals 10, so 100 ÷ 10 = 10 tens. You can think of it as ten groups of ten: 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 = 100.

B. 20 would give you 200 (20 × 10 = 200), not 100.

C. 30 would give you 300 (30 × 10 = 300), not 100.

D. 100 confuses the number 100 with how many tens it contains. 100 is the *total*, not the count of tens.

A. 53 is correct — it has the highest value. The tens digit (5) is larger than any other option's tens digit, so 53 is automatically the biggest.

Why the others are wrong:
- B. 35 — starts with 3 in the tens place, which is less than 5
- C. 23 — starts with 2 in the tens place, which is less than 5
- D. 14 — starts with 1 in the tens place, which is less than 5

A. 20 is correct because when you count up by ones, 20 comes immediately after 19.

B, C, and D are all wrong because:
- 21 comes *two* numbers after 19
- 22 comes *three* numbers after 19
- 23 comes *four* numbers after 19

A. 60 is correct.
The sequence increases by 10 each time (30 → 40 → 50), so the next number must be 50 + 10 = 60.

Why the others are wrong:
- B (70): This would mean the sequence jumps by 20, which doesn't match the pattern of adding 10.
- C (20): This goes backward and breaks the increasing pattern.
- D (10): This also goes backward and is too small.

A. 49 ✓

When we count in order (1, 2, 3... 48, 49, 50...), 49 comes directly before 50.

B, C, D are wrong because:
- 51, 52, and 53 all come *after* 50, not before it.

A. 25 ✓

This is the smallest because when you line up all the numbers (25, 45, 65, 85), 25 comes first—it's the lowest value.

Why the others are wrong:
- B. 45 – This is bigger than 25
- C. 65 – This is bigger than 25
- D. 85 – This is the largest of all four numbers

A. 90 is correct — Each number increases by 10, so 80 + 10 = 90.

B. 100 — Wrong; that would mean jumping by 20, which breaks the pattern of adding 10 each time.

C. 50 — Wrong; this goes backward and doesn't follow the increasing pattern.

D. 40 — Wrong; this also goes backward, opposite to the sequence's direction.

A. 8 — Correct
80 means 8 groups of 10, so there are 8 tens in 80. You can check: 8 × 10 = 80. ✓

B. 10 — Wrong
10 tens would equal 100, not 80.

C. 9 — Wrong
9 tens would equal 90, which is more than 80.

D. 7 — Wrong
7 tens would equal 70, which is less than 80.

A. 60 ✓

The number directly before 61 is 60—it comes immediately when you count backward by one.

Why the others are wrong:
- B (59): This is two numbers before 61, not the number immediately before it
- C (58): This is three numbers before 61
- D (62): This comes *after* 61, not before it