Addition and subtraction · Ages 6–7
4 × 4 sudoku worksheet
Part of: Addition and subtraction within 18
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4 × 4 sudoku worksheet
Addition and subtraction · Ages 6–7
Numsprite
numsprite.com
Name:Date:Score:／48
Write each answer in the space. For word problems, show your working and write a sentence answer.
Part A: Working out and filling in (2 marks each)
1.Every row of a sudoku must have 1, 2, 3 and 4, each only once. A row already has 3, 4 and 1. What goes in the last square?
Answer:
2.Every row, column and bold box of a sudoku must have 1, 2, 3 and 4. What goes where the ? is?
Answer:
3.Every row of a sudoku must have 1, 2, 3 and 4, each only once. A row already has 2, 3 and 4. What goes in the last square?
Answer:
4.Every row, column and bold box of a sudoku must have 1, 2, 3 and 4. What goes where the ? is?
Answer:
5.Every row, column and bold box of a sudoku must have 1, 2, 3 and 4. What goes where the ? is?
Answer:
6.Every row, column and bold box of a sudoku must have 1, 2, 3 and 4. The left ? is and the right ? is .
Fill in each blank
Answer:
7.Every row of a sudoku must have 1, 2, 3 and 4, each only once. A row already has 2, 1 and 4. What goes in the last square?
Answer:
8.Every row of a sudoku must have 1, 2, 3 and 4, each only once. A row already has 2, 4 and 3. What goes in the last square?
Answer:
9.Every row of a sudoku must have 1, 2, 3 and 4, each only once. A row already has 3, 1 and 4. What goes in the last square?
Answer:
10.Every row of a sudoku must have 1, 2, 3 and 4, each only once. A row already has 1, 4 and 2. What goes in the last square?
Answer:
11.Every row of a sudoku must have 1, 2, 3 and 4, each only once. A row already has 4, 3 and 2. What goes in the last square?
Answer:
Part B: Choose, or true or false (2 marks each)
12.Every row, column and bold box of a sudoku must have 1, 2, 3 and 4. Which number goes where the ? is?
- A. 1
- B. 3
- C. 2
- D. 4
Choose the right answer
Answer:
Part C: Word problems (4 marks each)
13.Every row of a sudoku must have 1, 2, 3 and 4. Ka-yan has written 4 and 1 in a row. What do the two numbers still to go in add up to?
Working:
Answer:
14.Tsz-ching and Ka-lok race to do a sudoku: every row, column and bold box must have 1, 2, 3 and 4. Tsz-ching has got this far. What goes where the ? is?
Working:
Answer:
15.Tsz-ching is doing a 4 × 4 sudoku. One empty square's row already has 1 and 2, and its column has 4. What goes in that square?
Working:
Answer:
16.May and Ka-yan race to do a sudoku: every row, column and bold box must have 1, 2, 3 and 4. May has got this far. What goes where the ? is?
Working:
Answer:
17.Tsz-hin is doing a 4 × 4 sudoku. One empty square's row already has 4 and 2, and its column has 3. What goes in that square?
Working:
Answer:
18.Every row of a sudoku must have 1, 2, 3 and 4. Ming has written 3 and 4 in a row. What do the two numbers still to go in add up to?
Working:
Answer:
Show the answers and working
4 × 4 sudoku worksheet: Answers and working
Part A: Working out and filling in
1. 2
Go through 1 to 4 one at a time: which number is the row still missing?
Of 1, 2, 3 and 4, the row has 3, 4 and 1; only 2 is missing, so the last square is 2.
2. 2
Look at the ?'s row first: which of 1, 2, 3 and 4 are already there?
The ?'s row already has 4, 3 and 1; of 1 to 4, only 2 is missing.
3. 1
Go through 1 to 4 one at a time: which number is the row still missing?
Of 1, 2, 3 and 4, the row has 2, 3 and 4; only 1 is missing, so the last square is 1.
4. 4
The ?'s row doesn't give enough, so look at its column instead: which numbers are already there?
The ?'s row has only one number, but its column already has 2, 1 and 3: only 4 is missing.
5. 1
Its row and column don't give enough, so look at the ?'s bold box: which numbers does it already have?
Its row and column don't say enough, but its bold box already has 2, 3 and 4: only 1 is missing.
6. 3, 1
First find the two numbers missing from the row, then see which of them the left ?'s column already has.
The row is missing 1 and 3. The left ?'s column already has 1, so it is 3, and the right one is 1.
7. 3
Go through 1 to 4 one at a time: which number is the row still missing?
Of 1, 2, 3 and 4, the row has 2, 1 and 4; only 3 is missing, so the last square is 3.
8. 1
Go through 1 to 4 one at a time: which number is the row still missing?
Of 1, 2, 3 and 4, the row has 2, 4 and 3; only 1 is missing, so the last square is 1.
9. 2
Go through 1 to 4 one at a time: which number is the row still missing?
Of 1, 2, 3 and 4, the row has 3, 1 and 4; only 2 is missing, so the last square is 2.
10. 3
Go through 1 to 4 one at a time: which number is the row still missing?
Of 1, 2, 3 and 4, the row has 1, 4 and 2; only 3 is missing, so the last square is 3.
11. 1
Go through 1 to 4 one at a time: which number is the row still missing?
Of 1, 2, 3 and 4, the row has 4, 3 and 2; only 1 is missing, so the last square is 1.
Part B: Choose, or true or false
12. D. 4
First find the two numbers missing from the ?'s row, then look at its column to cross one out.
The row has 2 and 3, so the ? is 4 or 1; the column has 1, so it is 4.
Part C: Word problems
Marking: 2 for the working, 1 for the answer, 1 for the sentence.
13. 5
First find which two numbers the row is still missing. Or think what 1 + 2 + 3 + 4 comes to.
The two left are 2 and 3: 2 + 3 = 5. Or take 4 and 1 from 1 + 2 + 3 + 4 = 10.
14. 1
The ?'s row, column and box each have one number. Cross out all three from 1 to 4 and see what is left.
The ?'s row has 2, its column 3 and its box 4: of 1 to 4, only 1 is left.
15. 3
Of the four numbers a sudoku uses, cross out 1 and 2 from the row, then 4 from the column.
Of 1 to 4, cross out 1 and 2 (the row) and 4 (the column): only 3 is left.
16. 2
The ?'s row, column and box each have one number. Cross out all three from 1 to 4 and see what is left.
The ?'s row has 4, its column 3 and its box 1: of 1 to 4, only 2 is left.
17. 1
Of the four numbers a sudoku uses, cross out 4 and 2 from the row, then 3 from the column.
Of 1 to 4, cross out 4 and 2 (the row) and 3 (the column): only 1 is left.
18. 3
First find which two numbers the row is still missing. Or think what 1 + 2 + 3 + 4 comes to.
The two left are 2 and 1: 2 + 1 = 3. Or take 3 and 4 from 1 + 2 + 3 + 4 = 10.
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