Reception Maths Making and splitting numbers: check-up and practice test questions

Key words. The whole is all of the things. The parts are the groups that make it.

Method. Put the two parts together, then count them all.

1. Find the first part: 2. Start with the bigger part and count on.
   2
2. Count on 4 more. Count on one at a time from the first part.
   2 + 4 = 6
3. Write the answer. The total is the whole.
   6

Check. Count the whole group one at a time: 6. ✓

Watch out. Count on from the bigger part. The total is always bigger than either part.

Key words. The whole is all of the things. The parts are the groups that make it.

Method. Put the two parts together, then count them all.

1. Find the first part: 3. Start with the bigger part and count on.
   3
2. Count on 2 more. Count on one at a time from the first part.
   3 + 2 = 5
3. Write the answer. The total is the whole.
   5

Check. Count the whole group one at a time: 5. ✓

Watch out. Count on from the bigger part. The total is always bigger than either part.

Key words. A missing part is the number we add to the known part to make the whole.

Method. The whole is 5. One part is 3. Find the other part.

1. Start with the whole: 5. The whole has all the things.
   5
2. Take away the part you know: 3. What is left is the other part.
   5 − 3 = 2
3. Check by counting on. 3 and 2 must make 5.
   3 + 2 = 5
4. Write the answer.
   2

Check. Count on from 3 to 5: 2 more. ✓

Watch out. Count on from the part you know, to reach the whole.

Key words. The whole is all of the things. The parts are the groups that make it.

Method. Put the two parts together, then count them all.

1. Find the first part: 6. Start with the bigger part and count on.
   6
2. Count on 4 more. Count on one at a time from the first part.
   6 + 4 = 10
3. Write the answer. The total is the whole.
   10

Check. Count the whole group one at a time: 10. ✓

Watch out. Count on from the bigger part. The total is always bigger than either part.

Key words. A missing part is the number we add to the known part to make the whole.

Method. The whole is 10. One part is 7. Find the other part.

1. Start with the whole: 10. The whole has all the things.
   10
2. Take away the part you know: 7. What is left is the other part.
   10 − 7 = 3
3. Check by counting on. 7 and 3 must make 10.
   7 + 3 = 10
4. Write the answer.
   3

Check. Count on from 7 to 10: 3 more. ✓

Watch out. Count on from the part you know, to reach the whole.

Key words. A double is two of the same number.

Method. A double is two equal parts. Add the number to itself.

1. Find the two equal rows of 4. The two rows are the same length.
   4 and 4
2. Count the total. Count both rows together.
   4 + 4 = 8
3. Write the answer.
   8

Check. Count on from 4 another 4: the answer is 8. ✓

Watch out. Doubles have two equal parts. Check that both rows match.

Key words. A double is two of the same number.

Method. A double is two equal parts. Add the number to itself.

1. Find the two equal rows of 5. The two rows are the same length.
   5 and 5
2. Count the total. Count both rows together.
   5 + 5 = 10
3. Write the answer.
   10

Check. Count on from 5 another 5: the answer is 10. ✓

Watch out. Doubles have two equal parts. Check that both rows match.

Method. Start with 0 and 5. Then move one counter at a time from one part to the other.

1. Start with all in one part. Use 0 in one part and the total in the other.
   0 and 5
2. Move one at a time. Each time, one more goes into the first part.
   5 pairs in order
3. Write the pairs. Include 0 and the total.
   0 and 5, 1 and 4, 2 and 3, 3 and 2, 4 and 1, 5 and 0

Check. Each pair adds to 5. ✓

Watch out. Keep a list in order, so you do not miss a pair.

Method. Add the two parts in each pair. The right pair makes 5.

1. Add the first pair. Check the total.
   1 + 3 = 4
2. Add the other pairs. Only one pair makes the whole.
   2 + 3 = 5
3. Write the answer.
   2 and 3

Check. 2 + 3 = 5. ✓

Watch out. Add both parts in each pair to check.

Method. A double has two equal parts.

1. Look at the parts. Each part is 3.
   3 and 3
2. Check they are equal. Two equal parts make a double.
   3 = 3
3. Write the answer.
   Accept any answer: 3 and 3 are two equal parts, so they are a double.

Check. Count 3 + 3 = 6. ✓

Watch out. The two parts must be the same number.

Key words. The whole is all of the things. The parts are the groups that make it.

Method. Put the two parts together, then count them all.

1. Find the first part: 2. Start with the bigger part and count on.
   2
2. Count on 5 more. Count on one at a time from the first part.
   2 + 5 = 7
3. Write the answer. The total is the whole.
   7

Check. Count the whole group one at a time: 7. ✓

Watch out. Count on from the bigger part. The total is always bigger than either part.

Key words. A missing part is the number we add to the known part to make the whole.

Method. The whole is 9. One part is 4. Find the other part.

1. Start with the whole: 9. The whole has all the things.
   9
2. Take away the part you know: 4. What is left is the other part.
   9 − 4 = 5
3. Check by counting on. 4 and 5 must make 9.
   4 + 5 = 9
4. Write the answer.
   5

Check. Count on from 4 to 9: 5 more. ✓

Watch out. Count on from the part you know, to reach the whole.

Method. Add the two parts in each pair. The right pair makes 4.

1. Add the first pair. Check the total.
   1 + 2 = 3
2. Add the other pairs. Only one pair makes the whole.
   2 + 2 = 4
3. Write the answer.
   2 and 2

Check. 2 + 2 = 4. ✓

Watch out. Add both parts in each pair to check.

Key words. A missing part is the number we add to the known part to make the whole.

Method. The whole is 10. One part is 4. Find the other part.

1. Start with the whole: 10. The whole has all the things.
   10
2. Take away the part you know: 4. What is left is the other part.
   10 − 4 = 6
3. Check by counting on. 4 and 6 must make 10.
   4 + 6 = 10
4. Write the answer.
   6

Check. Count on from 4 to 10: 6 more. ✓

Watch out. Count on from the part you know, to reach the whole.

Method. Start with 0 and 4. Then move one counter at a time from one part to the other.

1. Start with all in one part. Use 0 in one part and the total in the other.
   0 and 4
2. Move one at a time. Each time, one more goes into the first part.
   4 pairs in order
3. Write the pairs. Include 0 and the total.
   0 and 4, 1 and 3, 2 and 2, 3 and 1, 4 and 0

Check. Each pair adds to 4. ✓

Watch out. Keep a list in order, so you do not miss a pair.

Key words. A missing part is the number we add to the known part to make the whole.

Method. The whole is 10. One part is 6. Find the other part.

1. Start with the whole: 10. The whole has all the things.
   10
2. Take away the part you know: 6. What is left is the other part.
   10 − 6 = 4
3. Check by counting on. 6 and 4 must make 10.
   6 + 4 = 10
4. Write the answer.
   4

Check. Count on from 6 to 10: 4 more. ✓

Watch out. Count on from the part you know, to reach the whole.

Method. Add 5 and 5 together.

1. Count the first 5. Five things.
   5
2. Count the second 5. Five more things.
   5 + 5
3. Count all the things. Count on from 5 to 10.
   1, 2, 3, 4, 5, 6, 7, 8, 9, 10
4. Write the answer.
   No. 5 and 5 make 10.

Check. Count 10 things in all. ✓

Watch out. Count both fives, not just one.

Method. Start with the part you know, then count on to the whole.

1. Start with 4 fingers. The part you know is 4.
   4
2. Count on to 9. Count on one at a time: 5, 6, 7, 8, 9.
   5, 6, 7, 8, 9
3. Count your steps. You counted on 5 steps.
   5 steps
4. Write the answer.
   5. Four and 5 make 9.

Check. Count 4 and 5 fingers: 9 in all. ✓

Watch out. Count on from the part you know.

Method. Choose two pairs and check each pair adds to 10.

1. Choose a pair. Pick two numbers that you think make 10.
   3 and 7
2. Check it. Add the two numbers.
   3 + 7 = 10
3. Choose another pair and check it. Add them to see if the total is 10.
   4 + 6 = 10
4. Write the answer.
   Accept any two pairs that add to 10, such as 3 and 7, or 4 and 6, because each pair makes 10.

Check. Both pairs add to 10. ✓

Watch out. Check the total of each pair.

Method. Start with the red cubes, and count on to 8.

1. Start with 5. Lily has 5 red cubes.
   5
2. Count on to 8. Count on one at a time: 6, 7, 8.
   6, 7, 8
3. Count the steps. Three steps to reach 8.
   3
4. Write the answer.
   3. Five and three make 8.

Check. Count 5 and 3 together: 8. ✓

Watch out. Count on from the part you know.