Maths Year 1 Spring Place Value

Each unit has everything you need to teach a set of related skills and concepts.

1 more and 1 less than 2-digit number (suggested as 2 days)

Planning and Activities

Day 1 Teaching
Show children a bead bar with tags showing multiples of 10. Count on in 10s from zero. Point at different numbers and count on from these. What is the number after 45? Agree 46. 46 is 1 more. What comes before 45? 44 is 1 less. Repeat with 37 and other 2-digit numbers on a 0–100 beaded line. Show the numbers on a 1–100 grid.

Group Activities
-- Give clues for children to find numbers on a 1–100 grid. Describe each number’s position.
-- Make a 2-digit number and mark it on a 0–100 beaded line.

Day 2 Teaching
Write the calculations: 23 + 1, 34 + 1, 29 + 1, 99 + 1, 24 – 1, 67 – 1, 60 – 1, 80 – 1. For each, locate the first number on the 0–100 beaded line, count on/back one bead, label where they land, and draw a hop labelled + 1/– 1. Complete additions and subtractions on the board. Then use them to complete the sentences: ___ is more than ___, and ___ is less than ___.

Group Activities
Use the ‘Stop the bus!’ in-depth problem-solving activity below as today’s group activity.
Or, use these activities:
-- Make a 2-digit number and find one more/one less than this number.
-- Find numbers to make a blank number statement true.

You Will Need

  • 100 bead bar and tags
  • 0–100 beaded line (see resources)
  • 1–100 grid (see resources)
  • 10–100 number cards
  • ‘One more, one less’ sheet (see resources)
  • Whiteboards and pens
  • 0–9 number cards

Worksheets

Day 1
Find one more and one less than a 2-digit number.

Day 2
Work out the missing numbers on a 1–100 grid by looking at the numbers one more and one less than the mystery number.

Mastery: Reasoning and Problem-Solving

  • Find these numbers on a 0–100 bead string:
    13, 26, 48, 71 and 95.
  • What is the number after…
    (a) 46?
    (b) 59?
    (c) 80?
  • What is the number before…
    (a) 81?
    (b) 70?
    (c) 39?
  • Mystery number
    I add one to my number and get 75. What is my number?
  • Jim takes one away from his number and gets 52. What is Jim’s number?

In-depth Investigation: Stop the Bus!
Children write number sentences to show understanding of number order.

Extra Support

Tower Trios
Finding one more and one less than numbers up to 20