Work through the levels in order. Type your answer and press Check — open the worked solution if you get stuck. Answers like -6, 3/4 or 0.25 are typed exactly as shown. A ⭐ Bonus Challenge at the end is extra credit — skip it if the rest was hard work.
Level 1 · Warm-up
1 In 5628, what is the value of the 6?
Show worked solution
The 6 is in the hundreds column: 6 × 100 = 600.
2 Write 4000 + 300 + 90 + 2 as one number.
Show worked solution
4 thousands, 3 hundreds, 9 tens and 2 ones is 4392.
3 How many tens are there in 3400 altogether?
Show worked solution
Every hundred is 10 tens, so 3400 is 34 hundreds = 34 × 10 = 340 tens.
Level 2 · Core
4 A number is 6 thousands, 14 tens and 3 ones. Write it as an ordinary number.
Show worked solution
14 tens is 140, which is 1 hundred and 4 tens. So the number is 6000 + 140 + 3 = 6143.
5 In 7825, how many times more is the 8 worth than the 2?
Show worked solution
The 8 is worth 800 and the 2 is worth 20. Since 800 ÷ 20 = 40, the 8 is worth 40 times more.
6 Write the number that has 34 hundreds and 7 ones.
Show worked solution
34 hundreds is 3400 (3 thousands and 4 hundreds). Add the 7 ones: 3407.
Level 3 · Challenge
7 Which is bigger: 28 hundreds, or 3 thousands? Write the bigger one as an ordinary number.
Show worked solution
28 hundreds is 2800 and 3 thousands is 3000. So 3000 is bigger.
8 Write the smallest 4-digit number whose digits add to 8, using no zeros.
Show worked solution
Make the first three digits as small as allowed: 1, 1, 1 uses 3, leaving 5 for the ones. That gives 1115.
9 A 4-digit number starts with a 2. Take the 2 off the front and write it on the end instead. The new number is 3002. What was the original number?
Show worked solution
Take the 2 off the end of 3002 and 300 is left — those were the last three digits of the original number. Put the 2 back on the front: 2300. (Check: 2300 → take off the 2 → 300 → write the 2 on the end → 3002.)
⭐ Bonus Challenge · only if the rest felt easy
10 I am a 4-digit number. My thousands digit is 3, my hundreds digit is 0, my tens digit is double my ones digit, and all my digits add to 6. Who am I?
Show worked solution
Thousands 3 + hundreds 0 = 3, so the tens and ones must add to 3. The tens is double the ones, so ones = 1 and tens = 2. The number is 3021.