How many numbers are between 100 and 120 (including 100 and 120)? — 21.120 − 100 + 1 = 21 numbers (100 through 120 inclusive).
If I count by 1s starting at 110, what is the fifth number I say? — 114.110, 111, 112, 113, 114 — the fifth number is 114.
True or False: 120 is the same as twelve tens. — True.12 × 10 = 120. Twelve tens equals one hundred twenty!
In the number 107, what does the 0 mean? — There are no tens.107: 1 hundred, 0 tens, 7 ones. The 0 shows there are zero tens!
Maria counted 113 pennies. She needs 120. How many more does she need? — 7.120 − 113 = 7 more pennies needed.
Which number is NOT in the skip-count-by-2s sequence starting at 0? — 21.21 is odd — skip counting by 2 only lands on even numbers. 21 is not in the sequence!
Which numbers are in BOTH the skip-count-by-2s and skip-count-by-5s sequences under 20? — 10 and 20.Numbers that end in 0 appear in both: 10 and 20. Both sequences land on multiples of 10!
How many hops of 5 does it take to get from 0 to 40? — 8.5, 10, 15, 20, 25, 30, 35, 40 — that is 8 hops of 5.
A baker puts 5 cookies in each box. She fills 7 boxes. How many cookies? Use skip counting. — 35.5, 10, 15, 20, 25, 30, 35 — skip counting by 5 seven times gives 35 cookies.
Skip count by 2s from 14 to 20. How many hops? — 3.14 → 16 → 18 → 20 — that is 3 hops of 2.
What is the last number if you skip count by 5s starting at 5, making exactly 4 hops? — 25.5 → 10 → 15 → 20 → 25. Four hops of 5 from 5 reaches 25.
What number is 2 tens and 14 ones? (Remember to regroup!) — 34.2 tens = 20. 14 ones = 1 ten + 4 ones = 10 + 4. So 20 + 14 = 34!
How many ones are in 2 tens? — 20.1 ten = 10 ones. So 2 tens = 20 ones.
A number has the same digit in both the tens and ones place. Which could it be? — 33.33 has 3 in the tens place and 3 in the ones place — both are the same!
How many tens are in 100? — 10.100 = 10 tens. Ten groups of 10 makes one hundred.
Which number has FEWER ones: 38 or 83? — 83.38 has 8 ones. 83 has 3 ones. 3 < 8, so 83 has fewer ones.
Which addition does NOT require regrouping? — 61 + 3.1 + 3 = 4. No regrouping needed! The others all have ones sums ≥ 10.
What is 99 + 1? — 100.9 + 1 = 10 ones = 1 ten + 0 ones. 9 + 1 = 10 tens = 100. Answer: 100!
Lucy has 85 stamps. She gets 8 more. How many total? — 93.5 + 8 = 13 = 1 ten + 3 ones. 8 + 1 = 9 tens. Answer: 93 stamps.
Which shows the correct regrouping for 38 + 5? — 30 + 13 = 43.8 + 5 = 13. 30 + 13 = 43. That is how regrouping works!
What is the sum of 74 and 7? — 81.4 + 7 = 11 = 1 ten + 1 one. 7 + 1 = 8 tens. Answer: 81.
A class has 66 crayons. 6 more are added. How many crayons now? — 72.6 + 6 = 12 = 1 ten + 2 ones. 6 + 1 = 7 tens. Answer: 72 crayons.
True or False: The sum of 91 + 9 is 100. — True.1 + 9 = 10 = 1 ten + 0. 9 tens + 1 ten = 10 tens = 100. TRUE!
Which comparison is WRONG? — 45 > 54.45 has 4 tens; 54 has 5 tens. 4 < 5, so 45 < 54. The statement 45 > 54 is WRONG!
Find all numbers less than 50: 43, 51, 49, 50, 39. — 43, 49, and 39.43 < 50, 49 < 50, and 39 < 50. Those three are less than 50!
List from greatest to least: 60, 16, 61, 6. — 61, 60, 16, 6.Tens: 61 (6), 60 (6), 16 (1), 6 (0). Same tens for 61 and 60: 61 > 60. Order: 61, 60, 16, 6.
What is the SMALLEST two-digit number greater than 50? — 51.51 is the very next number after 50 — the smallest two-digit number greater than 50.
A student writes 42 > 45. Is this correct? — No, 42 < 45 because 2 < 5.Same tens (4), so compare ones: 2 < 5. Therefore 42 < 45. The student is WRONG.